Doco: Document container types centrally

[tnelson-doghouse]

For each Lagoon container type (nginx, php, etc), there be a central page that links to:

• The Docker Images page, eg. https://docs.lagoon.sh/docker-images/nginx/
• The relevant part of the Service Types page: https://docs.lagoon.sh/concepts-advanced/service-types/#nginx-php
• The GitHub page
• The Docker container
• A sample docker-compose config

These links should all be in a handy list that's the same format across all the pages, preferably either at the top or the bottom of each page. Maybe this box belongs on the Docker Images pages?

[tnelson-doghouse]

As a second stage, it might even be worth adding configs for particular container types under https://docs.lagoon.sh/concepts-basics/docker-compose-yml/ (ie. as sub-pages). But that would be more work, I think.

[Ayush9026]

/assign @Ayush9026 i will solve this issue