Does some winter cleaning on the site-template stuff :)
1. Migrated away from the custom conf format to plain old yaml
2. Made the images and image files match with the name from the yaml
file. (It's not a problem to have spaces in file paths, nor urls so I
don't see why we shouldn't)
3. Updated the relevant documentation
There is a small breakage in the api response for the meta field. It now
returns `{"screenshot_dimensions":{"width":1000,"height":800}}` which I
believe is a lot more useful than
`{"meta.screenshot_dimensions":"1000x800"}`
Besides, I don't believe this endpoint has any third-party consumers
that rely on the metadata since it's a rarely known feature anyways
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- Better naming of functions in existing templates
- Added LLVM Ir and Preprocessor templates
- Improved screenshot generation script
- Improved config file format (now the full URL can just be copied in instead of manually trimming the `https://godbolt.org/#`)
- Added `docs/AddingASiteTemplate.md`
