Dev Doc improvement

[HawkXP71 118]

The current root page of the dev documentation should have a "Plugin C# API" and "Server C# API" in its "Emby SDK" TOC on the left hand side.

Right now, to find either API, you have to realized its under the developer home (not obvious), then find the "worth a look" link in the "Emby Server .NET API" group.

It would be great if there was a quick link at the top to get to the "Documentation/reference/index.html" page

Scott

[Luke 42965]

@softworkz