Add project: mkdocs-recently-updated-docs

<!-- Please make sure that the project was not already added or suggested to this best-of list. You can ensure this by searching the projects.yaml, the README.md, and the issue list. --> **Project details:** - Project Name: mkdocs-recently-updated-docs - Github URL: https://github.com/jaywhj/mkdocs-recently-updated-docs - Category: 🌲 Git repos & info - License: MIT - Package Managers: PyPI **Additional context:** <!-- Optional. Add any other context or additional information about the project. --> One line of code to display a list of recently updated documents ## Features - Supports display of recently updated documents in an overall list - Flexible display position (`sidebar` or `in md document`) - Rich template examples - Works well for any environment (no-Git, Git, all CI/CD build systems, etc)