feat: resolve long-standing issues + fix minor bugs + update docs

[eels]

Description

• Add ability to page through retrieved results for all GET queries
  • This can be achieved by adding the page= query parameter onto all requests
  • By default the results return back the number of articles specified in the PAGE_SIZE environment variable
    • This has been created in favour of the former QUERY_LIMIT variable
    • A codemod + deprecation notice has been put in place as not to introduce breaking changes
    • This can be superseded on a per-request basis by also adding the page_size= query parameter
      • page_size= is an alias of the old limit= query parameter

GET /news?page=1&page_size=5

• Add ability to only fetch certain fields for all GET queries
  • index will always be retrieved
  • Uses the fields= query parameter with a comma-separated list of desired field names to return

GET /news?fields=author,title

• Fix the outputted docker-compose.yml file that was created with duplicate container_name properties
• Removed the need to specify API routes both with and without the id parameter by marking it as optional
• Replaced references to QUERY_LIMIT with PAGE_SIZE
• Updated README.md documentation with changes to APIs

Type of change

• [x] Documentation
• [x] Feature
• [x] Fix

Closes #3 Closes #5

[Ratstail91]

Thank you so much! This is quite a surprise. I'll test this out soon, and probably publish a release.