README + install: Step 5 trim + Superhuman install + Google Drive + ordering fix

- step-5-install.sh: add install_superhuman() (HTTP transport, no key — OAuth on first use), option 9, self-test, summary lines, case dispatch, INSTALLED_SUPERHUMAN flag, pre-existing detect
- README Step 5: rewrite as compact single-table reference — 9 tools in one row-per-MCP 'Needs' table; drop per-tool subsections (~150 lines saved); keep Playwright security note; keep Morgen-recommended callout
- README Step 5: SwiftKit description clarified — iOS/macOS/Swift dev toolkit, not generic '100+ tools'
- README Step 5: add 'Also worth flipping on — claude.ai connectors' section with Google Drive (hosted, not script-installed)
- README body: swap Step 7 (GitHub) and Step 8 (Safety Check) into numerical order — GitHub now comes before Safety Check
- Fixed stale 'Run Step 9' + 'After Step 9' headings inside Step 8 body (now Run/After Step 8)

Author: fidgetcoding