🐛 Fix trogdor release bugs (#383)

* 🐛 Resolve bug fixes from Trogdor

- reconstructed shares are not optional anymore
- tally should be check for specifically None as None is not falsey
- recovery public key are not optional anymore

* 🆙 Upgrade mkdocs to 1.2.1

mkdocs changes to handle newest version. Resolve issues revolving around this.

* ✅ Ensure linting passes

Author: keithrfung

mkdocs.yml

@@ -1,4 +1,5 @@
 site_name: ElectionGuard Python
+site_url: https://electionguard-python.readthedocs.io/
 # site_description:
 site_author: Microsoft
 # google_analytics: