A couple more notes about service planning
Fixing broken page sibling URLs
Whitespace tidy
Fix dodgy footer layout

We can't use Bootstrap's sticky footers, since our footer
are of unknown height.
Re-introduce row highlighting for services the user is involved in
Make service planning dates more obvious
Show most recent services first
Add implementation notes on branding files
The podcast should use the Apple logo
square_logo is now unused
Use the branding component as the cache key, not the filename
Fixing template for BS3
Remove caching of the CSS template fragments, to avoid confusion
Add a note about CachedStaticFilesStorage
Fix CSS changes not being displayed because they're cached
Remove unused tag library
Only include the header colour if it's set
Make it possible to configure the link colour
Use the fully qualified path to the podcast image
Fixing up flake8