Add documentation to project

[travishathaway]

Fixes: #67

To build and test locally run the following:

# From docs/
conda env create -f environment.yml --yes
conda activate conda-anaconda-telemetry-docs
make html

Serve with:

python -m http.server 8001 --directory _build/html

[kathatherine]

I've got some general punctuation and wording edits for you, but otherwise, this looks great to me! A good primer for people

[jezdez]

Looking good! Just a minor suggestion regarding the sitemap

[kathatherine]

LGTM!