* refactor: post-cleanup changes:
- add more unnecessary paths to .dockerignore
- remove librechat.yaml from main compose file (prevents from being required)
- do not create librechat.yaml during build (does nothing)
* docs: make config file instructions easier to read, more info throughout other docs
* docs: add custom config to menu
* Update custom_config.md
* Update docker_compose_install.md
* mkdocs plugins: add plugin for social cards and plugin that allow to exclude a folder
* docs: fix hyperlinks
* mkdocs: social cards (descriptions) for 'contributions' and 'deployment' guides
* mkdocs: social cards (descriptions) for all 'index.md'
* mkdocs: social cards (descriptions) for 'features' and 'plugins'
* mkdocs: social cards (descriptions) for 'general_info'
* mkdocs: social cards (descriptions) for 'configuration'
* mkdocs: social cards (descriptions) for 'installation'
* mkdocs: minor fixes
* update librechat.svg
* update how_to_contribute.md
add reference to the official GitHub documentation
