Make lesson text selectable and searchable

**Is your feature request related to a problem? Please describe.**
I can't select and copy any lesson text from the running app.

**Describe the solution you'd like**
Being able to select and copy text like in a pdf or web application.
Being able to hit Ctrl+F to search for any word of phrase and cycle through the occurances (like in any text editor or browser or pdf reader)

Why?
To report issues more easily, to quote and communicate with fellow students and teachers more easily about things which are unclear to them.