[web] Initial MVP

[jxson]

• [x] Test/lint tooling and CI setup #2
• [x] Discovery: discover and connect to peers #3
• [ ] Discovery: update on peer removal (disconnect, user initiated, etc.) #5
• [x] UI component tools initial boilerplate/setup CL#14522
• [x] Add PDF files and store them locally CL#14522
• [x] Synchronize PDF files across peers #6
• [x] PDF controls for navigating pages, controlling zoom, etc. #7
• [x] Syncbase integration #8
• [ ] Device set management (add/remove/manage peers so they can simultaneously read the same PDF) #9
• [ ] Latency measurements around Vanadium and Syncbase activity #10 (maybe some perf analysis)
• [ ] Debug view of peers and state (discovery, Syncbase activity, latency) #11
• [ ] Error component

/cc @jwnichls