[DEV-1958] Add help contact to sidebar.
[DEV-1958] Add getting started message to landing page sidebar.
[DEV-1958] Add forum title h1 to landing page.
Merge pull request #42 from roverdotcom/DEV-1958

[DEV-1958] Landing page tweaks.
[DEV-1955] Change header link names.
[DEV-1955] Update help page copy.
[DEV-1955] Update FAQ page copy.
[DEV-1955] Add styles for h3.
[DEV-1955] Add section-title class to FAQ page header.