[w3c/manifest] editorial: link or remove unused definitions (PR #1251)

Fixes the four ReSpec "nothing links to it" warnings. The applied display mode now starts as the result of the chosen display mode steps, which nothing called before; the CSP section links to fetching a manifest image resource; uses of "solid fill" link to its definition; and "icon" is no longer a dfn, since nothing linked to it.

This change:

* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)

Commit message:

editorial: link or remove unused definitions


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<a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/pull/1251.html" title="Last updated on Oct 9, 2026, 7:24 AM UTC (b103863)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1251/5b7041c...b103863.html" title="Last updated on Oct 9, 2026, 7:24 AM UTC (b103863)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1251

-- Commit Summary --

  * editorial: link or remove unused definitions

-- File Changes --

    M index.html (37)

-- Patch Links --

https://github.com/w3c/manifest/pull/1251.patch
https://github.com/w3c/manifest/pull/1251.diff

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