Set sidebar border-top to 0px $sidebar-bg
Match main background colour when collapsed
Use text-color-light for block quote border
Centre align sidebar text when collapsed
Don't show 'fetching links' for broken RSS feed
Fix sidebar background colour on mobile browsers
Use mixin for collapsed sidebar style
Copy images from _posts/_images/<post>/

- Work in progress, no optimisation done yet

- Ideally the images could be stored along with
  the markdown source, but it seems that isn't
  supported by jekyll for posts..
Hide sidebar loading status (to fail gracefully)

- Disable broken scripts from loading
Minor changes to sidebar