bitbots_docs: prevent overriding modified files during build
bitbots_docs: prevent overriding modified files during build

previously manualy modified index.rst or conf.py files would be reset
(overriden) during the build process. That is unwanted behavior and
removed with this commit.

bit-bots/bitbots_misc,bit-bots/bitbots_misc,bit-bots/bitbots_misc