Fix broken tutorial link and change wording

(cherry picked from commit cfe4152b1dba09d95387e62e8bb1f46cdd86c7da)
Use script to find remaining 404s. Fix them.

(cherry picked from commit a558e560bd98446a4876e2feefe640c7cbde1681)
Docs: fix header

(cherry picked from commit cbe86e04b3fdfee584f538e399b91863bd6c0feb)
Add CDNJS to docs. Fixes #244

(cherry picked from commit 3d1cc16a9b143b96b353b7b03c06ca0f7e544304)