I just learned that Bitbucket offers per-repo cloud storage for arbitary
files (the "Downloads" section on the web gui). Doing this before adding
another third-party deb to our build (rakurai), which is quite large at
140MB. We don't want to pack that into our repo.
* Remove mounted dirs (the repo is automatically persisted in a volume)
* Remove user specific shell env initialization scripts (they're more
trouble than they're worth, often break the devcontainer build)
* Remove redundant settings already defined in settings.json