[#56309436] Info icon is shown in Current Project cards

- Info icon displays workspace summary tooltip
[#56309436] Current Project cards show latest insight

- Unless there isn't one.
- Includes link to further insights, with count & pluralization
- Workspaces present latest insight
- chorus.pageParams() culls params object from window.location
- model.activities() passes options to new ActivitySet
Use jshint binary instead of gem

The gem hasn't been updated in years and 'rake jslint:changed' takes an annoying amount of time to start up (because JVM)

jshint config is now consolidated from jshint.yml/jshint_spec.yml into just jshint.json.
'rake jshint' and friends are deprecated in favor of script/lint_changed.sh and script/lint_all.sh

Also...
Remove unused variables found by jshint
Destroy ancient opt/git/hooks/pre-commit file