Improve style for Terminal session blocks

docs: fix multiple issues

Clean up unused and broken references
Clean up trailing whitespaces
Improve formatting in Digest reference
Add remaining hotlinks to Configuration book
Fix mistakes

Restyle Bash sessions in Connectors

Remove unused files

* Move search form to the left
* Pin left bar (add jquery.pin plugin)
* Move all configuration fields to confval directive
* Move builddirs to separate directories, so less rebuilds.
* Some minor fixes