Release v2.21.0 · boltdesignsystem/bolt

Fix: accordion open prop typo in web component demo #1809 (@mikemai2awesome)
Feature/academy blueprint updates #1798 (daniel.morse@pega.com @danielamorse)
Feat: Update Mission Modal Blueprint w/ new (WIP) Rating component #1813 (@sghoweri @mikemai2awesome)
Re-enable branch and commit-specific now.sh deploy preview URLs on Github #1815 (@sghoweri)
Typography | Docs | Map typography tokens to JSON data #1785 (@sghoweri @mikemai2awesome)
Faster Nightwatch.js tests on Travis CI (~3.5 mins faster!) #1804 (@sghoweri)
Speed up Pattern Lab compile times by 3x; speed up Travis #1802 (@sghoweri)
BDS-1573 action element schema #1789 (@remydenton daniel.morse@pega.com)

Add visual regression test to Blockquote to check that quote styles render correctly #1796 (@sghoweri)
fix: Rework logic for grid ordering in hero component #1799 (@remydenton)
fix: Allow card url attributes to be empty #1810 (@remydenton)
Fix List wrapping bug #1806 (daniel.morse@pega.com @danielamorse)
fix: Remove join filters and related workarounds in replacement card #1808 (@remydenton)
Prevent empty href attribute on web component version of bolt-link #1788 (@adamszalapski)
Hotfix: Fix for Composer Install Issues on Travis #1793 (@sghoweri)

[skip travis] chore(release): release v2.21.0 (@bolt-bot)
[skip travis] chore: version bump PHP-related dependencies to v2.21.0 (@bolt-bot)
fix: temporarily disable the futureEmitAssets output config option until the WriteFilePlugin plugin error is further debugged (@sghoweri)
Merge branch 'release/2.x' (@sghoweri)

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