[w3c/manifest] Added missing alt attributes to img elements. (#731)

Closes #729

This change (choose one):

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

The following tasks have been completed:

* [ ] Confirmed there are no new ReSpec errors/warnings. (Respec warnings panel seems broken.)

Commit message:

Added missing alt attributes to img elements.

This was blocking W3C autopublish.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/731

-- Commit Summary --

  * Added missing alt attributes to img elements.

-- File Changes --

    M index.html (21)

-- Patch Links --

https://github.com/w3c/manifest/pull/731.patch
https://github.com/w3c/manifest/pull/731.diff

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