v0.2.0

• web: overhaul config page (resolve #9, #11)
  • Removed port option on config page - use flags on invocation instead
• web: improve uploader error handling (resolve #13)
• web: log in after setting new password (resolve #10)
• cache: retry hash until it does not collide (resolve #8)
• web: avoid ID collision by adding /- as a prefix to all GET routes (resolve #7)
• cmd/airliftd: allow pasting images on web UI (resolve #6)