Fleshes out documentation for reproducibility purposes; other minor doc fixes. Resolves #282.

[ianmilligan1]

What does this Pull Request do?

This pull request fleshes out our documentation in a few places.

The main addition is to add reference to the "most-recent version of the Archives Unleashed Toolkit." This is exposed through linking to the release pages. It also adds an explicit section in the FAQ noting around reproducibility concerns.

I also made some minor changes that supported this:

• Highlighting the FAQ on the documentation page so that people could better discover that page;
• Minor typo fix
• Updating 2018 -> 2019

How should this be tested?

TravisCI should turn green. Somebody should read to make sure I haven't introduced any typos or weird grammatical constructions.

Interested parties

@ruebot @SamFritz

[codecov-io]

Codecov Report

Merging #283 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #283   +/-   ##
=======================================
  Coverage   96.22%   96.22%           
=======================================
  Files          35       35           
  Lines         557      557           
=======================================
  Hits          536      536           
  Misses         21       21

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[SamFritz]

Looks great! Thanks @ianmilligan1

[ianmilligan1]

Great, thanks for your reviews @SamFritz @ruebot! Should be good to merge if it checks out on all of your ends.