Update Document Templates to reflect newer wording and URLs (#4006)

* Add pragma once info to contributing guidelines

* Fix links in readme template to match doc site

* Revert changes to contributing doc as somebody already changed it

docs/documentation_templates.md

@@ -36,7 +36,7 @@ Make example for this keyboard (after setting up your build environment):
 
     make planck/rev4:default
 
-See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
 ```
 
 There needs to be two spaces at the end of the `Keyboard Maintainer` and `Hardware Supported` lines for it to render correctly with Markdown.