CLI: advise users to install it, not to 'download' it.
Overview: typo and grammar fixes.
#1: Move the API to reference.
#2: Replace the Push action by the Git icon.
#3 #4: Write context for the configuration screens.
#7: Kickass documentation of the configuration file.
#6: Document the environment variables.
Rename use-platform.sh into use-platform. Plus various small fixes.
Improve Drupal conf.
Fix commands from PR9
Rebase PR.
Merge pull request #25 from platformsh/pjcdawkins-proofreading/overview

Pjcdawkins proofreading/overview
Merge pull request #23 from pjcdawkins/proofreading/cli-no-download

CLI: advise users to install it, not to 'download' it.
Drupal: proofreading