Fix "lets" -> "let's" in dynamic.html

Super trivial typo fix. Thanks for making JS for cats!
images at 100% slash overflow fix, smaller header text to reduce scrollinggg, small font adjustments, css background attribute perf cleanup
Merge pull request #17 from nrrrdcore/master

Mobile Visual Fixes
Merge pull request #16 from toolness/patch-1

Fix "lets" -> "let's" in dynamic.html
Fixes typos
Merge pull request #18 from chrisbobek/master

Fixed a few typos
Fixed minor typo.
Merge pull request #19 from stdavis/master

Minor typo
merge in recent pull reqs