Cleanup, Fixes and Review Feedback

Includes mix fixes like:
- Fixing the documentation
- Making sure device and storage mounts work correctly
- Fixing broken things that where supposed to work according to the PR highlights
- Moving some additional things to TrueCharts based containers
- Hiding, changing and reordening some bad UI elements
- Adding support for supplementalGroup permissions

Co-authored-by: Dan Sheridan <dan.sheridan@postman.org.uk>
Co-authored-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>
Co-authored-by: Justin Clift <justin@postgresql.org>

docs/_static/custom.css

@@ -0,0 +1,6 @@
+:root {
+  --md-primary-fg-color:        #0096d7;
+  --md-primary-fg-color--light: #0096d7;
+  --md-primary-fg-color--dark:  #0096d7;
+  --md-footer-bg-color--dark:   #fffff;
+}