docs: Fix consistency issues with other repositories

[oSumAtrIX]

About

• This PR changes workflow and issue file names, fixes the consistency in the style of the README, contribution guidelines, issue templates, and workflows

Some inconsistencies would be considered to be kept in this repository as they looked better than in other reports. However, restoring consistency and then improving all repositories together is a safer approach.

Todo

• [ ] Rename GitHub issue tags

Review

• [ ] Workflows have been modified and need to be reviewed if they still work as expected
• [ ] Spelling mistakes
• [ ] Bad links in markdown or issue templates

[validcube]

🍜 Note: Before merging, merge this first

• #1701