feat(course-fixtures): update Redis challenge metadata and extensions

Add Odin to the list of supported languages for the Redis challenge.
Enhance the main description with a link to the official Redis docs.
Reorder and expand extensions: move Replication and RDB Persistence
extensions after Lists, Streams, and Transactions to improve progression.
Update URLs to point to the latest Redis documentation for accuracy.
docs(sqlite): rename description_markdown_template to description_md

Update course fixture for SQLite `.dbinfo` task by replacing 
`description_markdown_template` with `description_md` to standardize 
field naming. This improves consistency in the metadata and aligns 
with expected key names for rendering the stage description correctly.
feat(shell): add new "Build your own Shell" course

Add a complete new course for building a POSIX-compliant shell,
including command parsing, builtin commands, and process management.
Update fixtures, scenario imports, and course lists to include the Shell
course to offer users a medium difficulty challenge focused on shell
programming concepts and extensions.
docs(course-fixtures): add detailed description templates for stages

Add expanded markdown templates for stage descriptions in course-fixtures/git.js
to provide learners with more context and guidance about the tasks. Include
explanations of the `.git` directory structure and Git objects for the
"Initialize the .git directory" and "Read a blob object" stages.

This improves the learning experience by offering detailed info and references
within the course material.

Author: rohitpaulk

Makefile

@@ -17,43 +17,7 @@ refresh_concept_fixtures:
 	gsed -i '1s/^/export default /' mirage/concept-fixtures/*.js
 
 refresh_course_fixtures:
-	gh api repos/codecrafters-io/build-your-own-redis/contents/course-definition.yml \
-		| jq -r .content \
-		| base64 -d \
-		| yq -o json eval \
-		> mirage/course-fixtures/redis.js
-
-	gh api repos/codecrafters-io/build-your-own-docker/contents/course-definition.yml \
-		| jq -r .content \
-		| base64 -d \
-		| yq -o json eval \
-		> mirage/course-fixtures/docker.js
-
-	gh api repos/codecrafters-io/build-your-own-git/contents/course-definition.yml \
-		| jq -r .content \
-		| base64 -d \
-		| yq -o json eval \
-		> mirage/course-fixtures/git.js
-
-	gh api repos/codecrafters-io/build-your-own-sqlite/contents/course-definition.yml \
-		| jq -r .content \
-		| base64 -d \
-		| yq -o json eval \
-		> mirage/course-fixtures/sqlite.js
-
-	gh api repos/codecrafters-io/build-your-own-grep/contents/course-definition.yml \
-		| jq -r .content \
-		| base64 -d \
-		| yq -o json eval \
-		> mirage/course-fixtures/grep.js
-
-	gh api repos/codecrafters-io/build-your-own-dummy/contents/course-definition.yml \
-		| jq -r .content \
-		| base64 -d \
-		| yq -o json eval \
-		> mirage/course-fixtures/dummy.js
-
-	gsed -i '1s/^/export default /' mirage/course-fixtures/*.js
+	./scripts/refresh-course-fixtures.sh
 
 serve:
 	npm run start

mirage/course-fixtures/docker.js

@@ -56,39 +56,39 @@ export default {
       "slug": "ah7",
       "name": "The first stage",
       "difficulty": "very_easy",
-      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.\n\nHere's a sample table:\n\n| Column 1 Header | Column 2 Header | Column 3 Header |\n| --------------- | --------------- | --------------- |\n| Row 1, Col 1    | Row 1, Col 2    | Row 1, Col 3    |\n| Row 2, Col 1    | Row 2, Col 2    | Row 2, Col 3    |\n| Row 3, Col 1    | Row 3, Col 2    | Row 3, Col 3    |\n\nAnd a new edit that must be synced automatically",
-      "marketing_md": "In this stage, we'll do XYZ."
+      "marketing_md": "In this stage, we'll do XYZ.",
+      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.\n\nHere's a sample table:\n\n| Column 1 Header | Column 2 Header | Column 3 Header |\n| --------------- | --------------- | --------------- |\n| Row 1, Col 1    | Row 1, Col 2    | Row 1, Col 3    |\n| Row 2, Col 1    | Row 2, Col 2    | Row 2, Col 3    |\n| Row 3, Col 1    | Row 3, Col 2    | Row 3, Col 3    |\n\nAnd a new edit that must be synced automatically"
     },
     {
       "slug": "lr7",
       "name": "The second stage",
       "difficulty": "very_easy",
-      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.",
-      "marketing_md": "In this stage, we'll do XYZ."
+      "marketing_md": "In this stage, we'll do XYZ.",
+      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD."
     },
     {
       "slug": "qh7",
       "primary_extension_slug": "ext1",
       "name": "Start with ext1",
       "difficulty": "very_easy",
-      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.",
-      "marketing_md": "In this stage, we'll do XYZ."
+      "marketing_md": "In this stage, we'll do XYZ.",
+      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD."
     },
     {
       "slug": "wd5",
       "primary_extension_slug": "ext1",
       "name": "Finish with ext1",
       "difficulty": "very_easy",
-      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.",
-      "marketing_md": "In this stage, we'll do XYZ."
+      "marketing_md": "In this stage, we'll do XYZ.",
+      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD."
     },
     {
       "slug": "ae0",
       "primary_extension_slug": "ext2",
       "name": "Start with ext2",
       "difficulty": "very_easy",
-      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.",
-      "marketing_md": "In this stage, we'll do XYZ."
+      "marketing_md": "In this stage, we'll do XYZ.",
+      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD."
     },
     {
       "slug": "um4",
@@ -98,8 +98,8 @@ export default {
       ],
       "name": "Finish with ext1 + ext2",
       "difficulty": "very_easy",
-      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD.",
-      "marketing_md": "In this stage, we'll do XYZ."
+      "marketing_md": "In this stage, we'll do XYZ.",
+      "description_md": "In this stage, we'll do XYZ\n\n**Example:** ABC\n\nYour program will be executed like this:\n\n```bash\n$ echo \"apple\" | ./your_executable.sh -E \"a\"\n```\n\nYou program must ABCD."
     }
   ]
 }