UX / UI redesign

[pyricau]

• First Screen: Leaks
  • For each leak: description, counts, date of last leak for that group
  • Overflow Menu: About
• Screen: Heap dumps
  • For each analysis: one line summary
  • Dump heap & analyze
  • Import Hprof (with some explanation?)
• Screen: Single Analysis
  • Actions:
    • Explore hprof
    • Render hprof
    • Share hprof
    • Share full analysis
    • If failure: report to GitHub.
  • Info (card?)
    • Analysis time
    • Analysis duration
    • Heap dump time
    • hprof location (deleted in parenthesis if missing)
    • One line summary (2 new 4 know. 2 won't fix, or failure)
• Screen: Leak
  • Actions: open Heap Dump, share leak as text or on stack overflow, share heap dump file, learn more
  • Shows leak trace for currently selected leak instance, and provides access to list of leak instances to select a different one.

[pyricau]

Closing this as #1622 fixes most issues. There's still a ton of design improvements to be made, but the initial overhaul is done.