Pages generated from markdown in the ABC repo have a worse
navigation experience than other pages. Compare how
https://www.bitcoinabc.org/CONTRIBUTING.html
is missing any sort of back button like the RPC docs have:
https://www.bitcoinabc.org/doc/0.22.2/rpc/control/help/
This becomes especially apparent when these patches are applied: D7457 or D7438
While it's difficult to provide context-aware back buttons for these pages, we
can add a simple Back button that mimics the browser back button. This helps
make the navigation more consistent between pages.