v0.01 beta release-blockers

[alexmorley]

• [x] File handling: Requirements: No download before conversion finished (even though conversion is v. fast); avoid clashes if two people are downloading files at the same time (e.g. each session needs to be tracked
  • [X] make a hash of the post.dump html and use directly (or as key to) converted file names.
  • [x] Make sure most recent version is downloaded (i.e. update post.dump on edits)
• [x] Landing Page
• [x] Report Abuses of CoC section
• [x] Codify one more Code of conduct - https://github.com/alexmorley/CodeOfConduct.Builder/commit/c95c542ecdce6489f5491953084c3dbc2ae354de
• [x] handle missing fields