Signed-off-by: Rémy Coutable <remy@rymai.me>

Change to use a better title style

Add backticks to code segments

Spelling and Grammar

Adjust bug template to adhere to standard bug report format

* https://developer.mozilla.org/en-US/docs/Mozilla/QA/Bug_writing_guidelines
* Guidelines use the following format

- Summary
- Steps to Reproduce
- Expected Behaviour
- Actual Behaviour

These guidelines cover the performance requirement for newly submitted
merge requests. These guidelines are put in to place to prevent merge
requests from negatively impacting GitLab performance as much as
possible.

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gitlab-org/gitlab-ce/issues/14905#note_12235996

This reverts commit 3e991230.

# Conflicts:
#	app/models/project.rb

Signed-off-by: Rémy Coutable <remy@rymai.me>

Now that we autoscale runner, we don't need to optimize for their usage
anymore. Abusing of "ci skip", for instance for view changes can lead to
broken specs, so let's just not use it!

Signed-off-by: Rémy Coutable <remy@rymai.me>

I noticed that the contributing guidelines still link to the thoughtbot
code review guidelines even though we already have our own.

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Add SCSS Lint, CSSComb config file, run SCSS Lint in GitLab CI, add documentation for SCSS Style Guide.

See !3069 for more information.

Also, link to this new paragraph in PROCESS.md and improved a bit this
document.

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Fixes #12784

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