Fix some indent-related style lints.

[anntzer]

Deleting most of the comments in tinypages/conf.py seems better than
trying to fix them...

PR Summary

PR Checklist

• Has pytest style unit tests (and pytest passes).
• Is Flake 8 compliant (run flake8 on changed files to check).
• New features are documented, with examples if plot related.
• Documentation is sphinx and numpydoc compliant (the docs should build without error).
• Conforms to Matplotlib style conventions (install flake8-docstrings and run flake8 --docstring-convention=all).
• New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
• API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).

[jklymak]

I have no idea what tiny pages is, but why is it OK to wipe all the comments? Are they boilerplate somehow?

[anntzer]

It's just a minimal sphinx project that's used as part of the test suite to test the sphinx directives we provide (.. plot::, mostly).