Link the github repository into docs

[ricardodarocha]

Implements the topic "adding a git repository" of mkdocs-material tutorial https://squidfunk.github.io/mkdocs-material/setup/adding-a-git-repository/

[ricardodarocha]

• [x] Read the documentation Implements the topic "adding a git repository" of mkdocs-material tutorial https://squidfunk.github.io/mkdocs-material/setup/adding-a-git-repository/
• [x] Edit the markdown
• [x] Pull Request
• [x] Pull Accept