Google sheet for reporting issues with mapgen

### Is your feature request related to a problem? Please describe.

A lot of the mapgen is outdated and doesn't fit the theme anymore / has weird spawns / spawns too often or not often enough / ... and not everyone wants to make an issue about it so I've made a spreadsheet people can be pointed to whenever they have a complaint and I'll take a look at it.

### Solution you would like.

Link to the spreadsheet: https://docs.google.com/spreadsheets/d/1vb336orvGpthZb869UXZc6GZCr_z0fBVTJU82izb2I0

### Describe alternatives you have considered.

Opening an issue for each separate problem, not everyone has or wants to have a github account, write down a detailed explanation and hope someone picks it up.
A spreadsheet is (for me at least) more organized and makes it easier to keep track of issues.

### Additional context

Please play nice and don't delete rows that others have added or grief the spreadsheet, if it happens too much I will stop this :)

Start by reading the issue body and reviewing the linked Google Sheet to understand the proposed mapgen reporting workflow. Done would require a maintainer decision on whether and how this external spreadsheet should be adopted or linked by the project.

Written by the indexing model from the issue text.