[w3c/manifest] Various fixes to ImageResource processing algorithms (#811)

This change (choose one):

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

Commit message:

Normative:

- Removed passing the name of the member to the processing algorithm. It
  just directly takes the array of image resources. This fixes a
  mismatch between the callers (which were already passing the array)
  and the definition of the algorithm.
- Removed definition of steps for processing "src". This was doing
  almost nothing; just inline the parsing of the URL.
- Copy "platform" into the output array.

Formatting:

- Fixed links to "sizes" definition.
- Remove redundant list in processing algorithm.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/811

-- Commit Summary --

  * Various fixes to ImageResource processing algorithms:

-- File Changes --

    M index.html (103)

-- Patch Links --

https://github.com/w3c/manifest/pull/811.patch
https://github.com/w3c/manifest/pull/811.diff

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