Make doc rebuild run unprivileged, remove redundant build, add verbose

Co-authored with @lunkwill42

tools/docker/doc-watch.sh

@@ -1,13 +1,12 @@
-#!/bin/bash -e
+#!/bin/bash -ex
 # Rebuilds Sphinx documentation on changes
 #
 cd /source
 # Build once first
-sudo -u nav python3 -m build  # ensure build data and .eggs aren't stored as root
-pip install -e .
-sudo -u nav sphinx-build doc/ build/sphinx/html/
+pip install -vv -e .
+sphinx-build doc/ build/sphinx/html/
 # Then re-build on any changes to the doc directory
 while inotifywait -e modify -e move -e create -e delete -r --exclude \# /source/doc /source/NOTES.rst
 do
-  sudo -u nav sphinx-build doc/ build/sphinx/html/
+  sphinx-build doc/ build/sphinx/html/
 done