Previously, the "assets" subdirectory of various bots was not
being copied to the "static/generated/bots/" folder, which
resulted in the documentation on some pages not loading at all.
(cherry picked from commit 605e9065a2)
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.