Clean files

- Delete abstractmultilayerugraph_development.jl
- Update badges in README
- Update CI workflow with DOCUMENTER_KEY

Co-Authored-By: Claudio Moroni <43729990+ClaudMor@users.noreply.github.com>
Co-Authored-By: Pietro Monticone <38562595+pitmonticone@users.noreply.github.com>

Author: 3 people

.github/workflows/CI.yml

@@ -64,7 +64,7 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-docdeploy@v1
         env:
-          #GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DOCUMENTER_KEY: ${{ secrets.DOCUMENTER_KEY }}
       - run: |
           julia --project=docs -e '

README.md

@@ -8,7 +8,7 @@
 [![Format Check](https://github.com/JuliaGraphs/MultilayerGraphs.jl/actions/workflows/FormatCheck.yml/badge.svg)](https://github.com/JuliaGraphs/MultilayerGraphs.jl/actions/workflows/FormatCheck.yml)
 [![Coverage: Codecov](https://codecov.io/gh/JuliaGraphs/MultilayerGraphs.jl/branch/main/graph/badge.svg?token=Z758JuxDJX)](https://codecov.io/gh/JuliaGraphs/MultilayerGraphs.jl)
 [![Coverage: Coveralls](https://coveralls.io/repos/github/JuliaGraphs/MultilayerGraphs.jl/badge.svg?branch=main)](https://coveralls.io/github/JuliaGraphs/MultilayerGraphs.jl?branch=main)
-[![Code Style: Blue](https://img.shields.io/badge/code%20style-blue-4495d1.svg)](https://github.com/invenia/BlueStyle)
+[![Code Style: Blue](https://img.shields.io/badge/Code%20Style-Blue-4495d1.svg)](https://github.com/invenia/BlueStyle)
 [![DOI: Zenodo](https://zenodo.org/badge/490352002.svg)](https://zenodo.org/badge/latestdoi/490352002)
 
 <img align="right" width="220" height="220" src="https://github.com/JuliaGraphs/MultilayerGraphs.jl/blob/main/docs/src/assets/logo.png?raw=true">