Added link to source.
Colophon -> Source
Put source in navigation bar.
Linked github.
Corrected length phrasing
Documented begins-with? and ends-with?
Documented index-of.
Corrected nil-case.
Embellised code tags.
Explained substring.
Rephrased.
Elaborated on end - start.
Warning for forward compatibility.
Documented english-string methods.
Corrected replacement/copying error.
Added missing preposition.
Qualified the rules for english-string methods and non-alpha characters.
Surrounded weird punctuation phenomenon with a code block.
Wrote other code blocks for consistency.
Corrected weird capitalization.