V3.3.0 on PyPi

• updated build (for PEP 621, etc.)
• using nx.DiGraph instead
• new release procedures

What's Changed

• update scrubber documentation by @Ankush-Chander in #238
• [Snyk] Security upgrade tornado from 6.2 to 6.3.3 by @ceteri in #240
• [Snyk] Security upgrade tornado from 6.2 to 6.3.3 by @ceteri in #250
• make lemma_graph undirected by @Ankush-Chander in #264
• [Snyk] Security upgrade jupyter-server from 1.24.0 to 2.11.2 by @ceteri in #270
• [Snyk] Security upgrade werkzeug from 2.2.3 to 3.0.1 by @ceteri in #268
• build updates by @ceteri in #273

Full Changelog: v3.2.5...v3.3.0