Documentation Link setup in Admin

[acketon]

Requirements

• A standardized way of adding a documentation link to the WordPress admin bar is added.
• The method of adding the documentation link should not be inherently BU-specific; ie, someone using this on an open source project should be able to provide their own documentation URL.
• If any BU-specific code is needed, it should be located in https://github.com/bu-ist/bu-responsive-customizations/
• A method of adding CSS or changing the display of a page on the documentation domain should be available to a designer.
• A method of using a different page template for the front page of a documentation site should be available to a developer.
• The final proposed direction should consider the use cases and common tactics we've used that Alana has summarized in https://github.com/bu-ist/responsive-framework-1x/issues/245

Original Request

In custom themes we add a documentation link to the menu bar. I believe this is done via PHP like in Theology theme here: https://github.com/bu-ist/r-theology/blob/e81600b0ec23a84c70ed1b738c11af8a8952912b/functions.php#L532

However, in Custom CSS only sites and/or Companion theme sites there is not a method to do this via the admin. I propose adding a site option and/or admin settings page that would allow ID Admins the ability to add the url to the documentation site from within the WP admin instead of doing it in code only.

[ashleykolodziej]

Next steps:

• Determine how this is added to framework (BU Responsive Customizations)?

[ashleykolodziej]

Alana wrote some good use cases for this over here: https://github.com/bu-ist/responsive-framework-1x/issues/245

[saucyrooster]

Additionally, I believe that the documentation should be a standard theme/look & feel across ALL documentation. ie: Child themes, products and plugins.
Proposed Mocks