Update for release

[oruebel]

• Fix #4 Compute and cache release timeline
• Add NWB-GUIDE to the repo
• Add support for per-repo start-time
• Update code stat plot rendering
• Fixed rendering of release timeline area plots to use step='post' interplolation
• Update plot_release_timeline and
• Add GitHub workflow to build the docs from the current, existing data
• Add GitHub worklow to compute the code statisics
• Add notebook by Ben Dichter with code to compute NWB statistics for DANDI