Use protocol-less links to resources

This fixes warnings about mixed content when using HTTPS.
making lvl19 render without canvas
Merge pull request #117 from nyuszika7h/protoless-resources

Use protocol-less links to resources
wav -> mp3
crediting Marijn Haverbeke
minor
Still trying to pay CDN bills
minor
minor fix to lvl05
Merge branch 'master' of github.com:AlexNisnevich/untrusted
a game by Alex Nisnevich and Greg Shuflin
make deploy-github
let's not use my own git shortcuts
Corrected grammar of function description.
Merge pull request #118 from SWPhantom/patch-1

Corrected grammar of function description.
making music files only load when not muted, to save bandwidth
Merge branch 'master' of github.com:AlexNisnevich/untrusted
binding 5 to wait command, and documenting it - closes #119
Synonyms to window

Block usage of "window" synonyms.
Update robot_maze_bfs.md