Map Generator Go Code Documentation (#2656)

Resolves #2602

## Description:
tldr: `npm run docs:map-generator`

Adds documentation to the `map-generator` go code.

This has no functional changes, other than the renaming of the package.
I used the github url, though this can be set to anything as long as it
contains a `.` so that the docs parse it correctly. Go doc best
practices seem a little verbose and terse, but attempted to comply

Future Facing (to get these docs viewable without running locally):
- Wait until the -http issue is sorted, then these are easy to
statically host alongside builds
- Could use the legacy `godoc`
- Could do formatting after outputting the `txt` output


## Change List:

- Add documentation to all types/fns in map-generator go code
- Ensure this outputs correctly with `go doc`
- Add `docs:map-generator` command to package.json. This runs `go doc`
in `map-generator` w/ appropriate flags to generate full documentation.
(see notes in readme)
- rename `map-generator` module to work around pkgsite assuming all
packages without a . are stdlib (this makes `-http` work at all)
- Add new sections to README and update existing sections
- Add additional references to locations in the primary code base where
things can be found
- Update documentation in the ts theme files to add output color
mappings - this ensures that everything needed to trace the input file
-> in game rendered asset is fully documented.


## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tidwell

package.json

@@ -9,6 +9,7 @@
     "dev": "cross-env GAME_ENV=dev concurrently \"npm run start:client\" \"npm run start:server-dev\"",
     "dev:staging": "cross-env GAME_ENV=dev API_DOMAIN=api.openfront.dev concurrently \"npm run start:client\" \"npm run start:server-dev\"",
     "dev:prod": "cross-env GAME_ENV=dev API_DOMAIN=api.openfront.io concurrently \"npm run start:client\" \"npm run start:server-dev\"",
+    "docs:map-generator": "cd map-generator && go doc -cmd -u -all",
     "tunnel": "npm run build-prod && npm run start:server",
     "test": "jest",
     "perf": "npx tsx tests/perf/*.ts",