Assistant: Decide web technology for the web assistant

Originally created by @sajolida on #9214 (Redmine)

We discussed internally using bootstrap (http://getbootstrap.com/), this should be carefully considered, tested in combination with ikiwiki and presented to the project as a whole.

Parent Task: #8588 (closed)

Subtasks

• #9215 (closed)
• #9216 (closed)
• #9217 (closed)
• #9314 (closed)