DOC: simplify theme footer config (fixes #60647)

Author: AswathyAR

doc/source/Contribution_plan.md

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+# CONTRIBUTION_PLAN
+
+## 1. Project
+- pandas (📘 documentation)
+
+## 2. Issue
+- #60647: “DOC: Simplify pandas theme footer”
+
+## 3. Why
+- Beginner-friendly, docs-only, no code.
+- Helps modernize the docs and maintain consistency.
+
+## 4. Steps
+1. Fork & clone the repo.
+2. Create branch `docs/simplify-footer`.
+3. Edit `doc/source/conf.py`, simplify/remove custom footer.
+4. Commit: `git commit -m "DOC: simplify theme footer (fix #60647)"`.
+5. Push to branch, open PR.
+
+## 5. PR Expectations
+- Title: `DOC: simplify theme footer (closes #60647)`
+- Body: Briefly explain change and reference issue.
+- CI in pandas checks: doc build only, so no tests should fail.
+- Respond to maintainers' feedback.