Add language metadata and sort/filter options

[raxod502]

I would like to add additional metadata to each language which can be used to make languages of interest more discoverable. Here are some sample pieces of metadata:

• Description
• Year created
• Maintenance status
• Categories (compiled, interpreted, markup, lisp, c-like, jvm, assembly, esoteric, general-purpose, etc.)
• Web links
  • Homepage
  • Documentation
  • Source code
  • Getting started / tutorial
  • Rosetta Code / Esolangs entry
• Support for LSP, code formatting, package management

Once metadata has been added, the home page should allow users to filter and sort by any of these fields.