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summary: mostly cleaning up some bad code, and improved how element mutation detection works (so we can owowify mutated element better)

• no more global variables (except maybe "local" function variables in the IIFE)
• removed initObserver function because of code smell
• added state-checking for window location href and document title, making them always owowified
• renamed some function to better names: owowifyElement -> owowifySubtree, owowifyNode -> owowifyTextNode, isElementValid -> isElementValidOwowify, and more
• rewrote subOwoEmote function because of bad code
• improved substitution of "l" in the owowify translation process to be less disruptive. notable change when using this is "lmao" is not translated to "wmao"
• better variable naming in ".replace" function callback
• removed author note

• modified author note to use less swearing words
• exclude performance note on description (and include it later on the comment)