Page Scaling

[sithel]

Related to Issue #12

What this PR includes:

• calling out page scaling & adding the 'original' option (as requested by someone on discord)
• calling out page positioning & adding the 'snug to binding option
• allowing padding in pts (dumb, but whatever-- easy for now) to binding/fore edge/top/bottom
• addition of 3 test PDFs in the docs folder to help with ratio/testing scaling stuff....

Not covered in this PR:

• switching the 'wacky' fore edge padding to this method. Will do so later & add support for the other 3
• adding support for padding on just one side of spread and/or support for 'creep' based on anything... was discussed on discord, but not touching any time soon....

I'm going to do another pass of testing tomorrow, want to post this and get first impressions/review my own stuff... Do not feel like writing tests for this... sorry 😓 I will, tomorrow, list out some key manual tests and verify them, flexing the different combo of settings. Will probably enumerate list of manual tests that are good to run on README....

Ugly new UX :

Am open to suggestions on how to format that better-- are you ok if I solicit the discord for UX suggestions/guidance?

[sithel]

am not properly/consistently using the phrases "padding" or "margin" -- what should I call this gap? (I think "padding" is what I settled on in code?)

[momijizukamori]

if you resolve the merge conflicts, this will be good to go I think.

[sithel]

Appreciate approval! 🙏 Am still going to go through and do an audit/screenshot of the 3 different docs in the various layouts before landing. (especially since I just found a bug doing so)