Create language specific guides for AutoDevOps

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Based on https://gitlab.com/gitlab-org/gitlab-ce/issues/65166#note_198253741

I see heroku does that for popular languages https://devcenter.heroku.com/categories/language-support

Screen_Shot_2019-07-31_at_15.28.43

What to cover:

  1. What needs to be done to get working pipeline from build to production without custom gitlab-ci.yml
  2. Database support and recommended values for DB_INITIALIZE and DB_MIGRATE
  3. Real world application with auth, database schema, CRUD. Sample repositories under GitLab autodevops-examples subgroup.
Edited by 🤖 GitLab Bot 🤖