add block elements back into oerpub index file
fix css for note placeholders
fix editing placeholder text
fix editing things with placeholders
fix note plugin mapping errors
fix mapping error with exercises
Revert "add block elements back into oerpub index file"

This reverts commit 78a72257322ed9ca91cd01218892c8bef764a5e6.

Conflicts:

	oerpub/index.html
remove wysiwhat from everything which are not demos
Update dev-workflow.md

Switched the branch name "dev" to "testing"
Make all paths relative, drop base tag

For this demo, it is okay that we operate <base/>less. The slot is still
there and will be filled up remix.
Clean up our settings file a bit.