tools/setup/generate_zulip_bots_static_files now starts off by
deleting static/generated/bots/ (if it hasn't been removed already)
so that outdated static files from older versions of the zulip_bots
package don't supress errors in the main repo that would otherwise
break.
For more info, see #7542Fixes: #7542.
This directory contains scripts that are used in building, managing,
testing, and other forms of work in a Zulip development environment.
Note that tools that are also useful in production belong in
scripts/ or should be Django management commands.