mark where text is substituted

- use mark
- mark is bold, remove default background (yellow)
editorial improvements

- Fire Emblem inspired story details (change data)
- ajdust sizes of input fields
- booleans to indicate if female and if adjective begins with vowel
- remove `mark` from pronouns (reserve for madlib subs)
- use booleans to handle pronouns
- use boolean to handle a/an before adjective