[w3c/webauthn] 40b11e: Markdown cleanup (#75)

  Branch: refs/heads/master
  Home:   https://github.com/w3c/webauthn
  Commit: 40b11ed5d4d5f379ab47a41007bcb298a3e45780
      https://github.com/w3c/webauthn/commit/40b11ed5d4d5f379ab47a41007bcb298a3e45780
  Author: Vijay Bharadwaj <vijaybh@users.noreply.github.com>
  Date:   2016-04-26 (Tue, 26 Apr 2016)

  Changed paths:
    M index.src.html

  Log Message:
  -----------
  Markdown cleanup (#75)

* Markdown cleanup

No changes to substance here. Goal of this change is to make the spec
easier to work on, not to fix the content.

- Wrap all lines at 128 chars (wide enough for modern screens, small
enough to fit in most commonly-sized windows)
- Remove extraneous HTML tags
- Convert HTML tags to Markdown equivalents
- Define macros for a couple of commonly used phrases so it's easier to
type and to keep consistency throughout the spec

* Fixed links

Bikeshed does not support markdown for links - I had realized this
earlier but had not reverted all the links to href form. Finishing the
job.