Major rewrite of the map page

Fixes #6
Fixes #7

Settled on (u, v) for Montgomery coordinates.
Settled on "." to denote scalar multiplication,
Settled on nothing for regular multiplication.

Rewrote practically the whole page.
Note that "Method 2" was changed to reflect an extremely recent insight,
that has been commited to Monocypher just hours ago.

The table section has been left alone, and needs to be fixed:
- The Curve25519 Montgomery base point is now obsolete.
- The Curve448 base points should be carefully selected to facilitate
  implementations.
- The "nothing up my sleeve" aside should be toned down (the choice of
  the low order point is highly constrained, and demonstrably has no
  impact).