[w3c/manifest] Link fixes 2019-09-20 (#801)

Progress on #735

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [ ] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [x] Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

Fixing some link issues found by the Link Checker.

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/801

-- Commit Summary --

  * Fixing Intel link to make HTTPS
  * Swapping "Start Register" (which is invalid) for Register which is found
  * tidy
  * Adding www to avoid redirects

-- File Changes --

    M index.html (25)

-- Patch Links --

https://github.com/w3c/manifest/pull/801.patch
https://github.com/w3c/manifest/pull/801.diff

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