docs: remove files which aren't formula-specific [skip ci]

Further reason is to avoid issues with `rst-lint`: ``` ERROR docs/index.rst:10 Unknown directive type "toctree". ```
saltstack-formulas · May 17, 2021 · 1b2c50a · 1b2c50a
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diff --git a/docs/conf.py b/docs/conf.py
diff --git a/docs/index.rst b/docs/index.rst