Host the most recent version of the FakeItEasy docs on the FakeItEasy website

[blairconrad]

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[blairconrad]

Steps for adding the docs:

1. check out FakeItEasy (I used master, since its docs have the latest content and the tools for building using material for mkdocs and mike)
2. ensure the proper python packages are installed (feel free to use a virtual environment):

   pip install --requirement docs/requirements.txt

3. check out fakeiteasy.github.io
4. create host-docs branch from upstream/master. Do not switch to it. Stay on master
5. add the docs

   mike deploy 7.3.1 stable --branch host-docs --prefix docs --update-aliases --config-file ..\FakeItEasy\mkdocs.yml

this will add docs for 7.3.1 with the alias "stable" pointing at them, and commit on the host-analyzer-docs branch

As a bonus:

mike set-default stable --branch host-docs --prefix docs --config-file ..\FakeItEasy\mkdocs.yml

to make "stable" the default branch, so we can visit https://fakeiteasy.github.io/docs

We shouldn't need to "set-default" in the future.