Update documentation for Template Locations
Update documentation for Template Locations

- Apply coding standards
- Reformat Markdown
- Improve wording, fix spelling
- Improve structure

This commit also deprecates the wiki page about custom template locations.

gchtr/timber,jarednova/timber,gchtr/timber,timber/timber,jarednova/timber,josephbergdoll/timber,gchtr/timber,josephbergdoll/timber,jarednova/timber,timber/timber,josephbergdoll/timber