[FEATURE] Fixed navigation

The menu to jump between the keywords is fixed such that it can be
used even if the page is scrolled down.
[FEATURE] Automatic references of delegation contexts

The execution context of given closures is referenced automatically.
The target is parsed from the method declaration.

The existing regex to receive the name of the current keyword now
recognizes static members, keywords containing digits and underscores
and less depends on a correct code formatting.
Updated .gitignore