Fix Bug 1102508: Link Syntax to Syntax Help Article

Added javascript to detect syntaxbox and twopartsyntaxbox and create a link to help articles based on if there is a CSS class identifying the language, falling back to the language the section is in if there is not.

Added CSS to style the link.
Fix Bug 1102508: Link Syntax to Syntax Help Article

Prevent prism from styling syntaxbox and twopartysyntaxbox so that we can link the syntax to articles explaining it.

Update styles so they're still styled correctly without prism.
Merge pull request #2953 from stephaniehobson/BUG-1102508-syntax

Fix Bug 1102508: Link syntaxboxes to Syntax Help Article