FLUID-5439: Converting page to markdown.
FLUID-5439: Fixing list styling.
Merge branch 'master' into FLUID-5439
FLUID-5439: Fixes to tutorial links to reference sub-folders.
FLUID-5439: Remove link to useless file

Removed link to "Using the Preferences Framework with User-Defined Grades" since the page hasn't been ported and isn't actually deemed useful yet. If we add the page, we can add the link.
Merge branch 'master' into FLUID-5439
Merge remote-tracking branch 'origin/FLUID-5439' into FLUID-5439
FLUID-5439: Remove links to old tutorials
Merge remote-tracking branch 'anastasia/FLUID-5439'

* anastasia/FLUID-5439:
  FLUID-5439: Remove links to old tutorials
  FLUID-5439: Remove link to useless file
  FLUID-5439: Fixes to tutorial links to reference sub-folders.
  FLUID-5439: Fixing list styling.
  FLUID-5439: Converting page to markdown.