Show how to do internal guides links in CONTRIBUTING.md #179
Description
Whenever one section of the guides links to another section, it should use relative links. Please add a section to CONTRIBUTING.md that shows people how to make these links.
Incorrect: https://guides.emberjs.com/release/routing/query-params/
Correct: ../routing/query-params/
The catch is that if you're in an index.md, you only need to go up one level to reference something in another topic, i.e. ../main-topic/subtopic. If you are in a md file of another name, and you want to link to another topic, it's two levels, ../../main-topic/subtopic. If the pages are in the same main topic, the link is ../subtopic. Your PR should include examples.
Include a note that API docs links should go to /release/. For now.