[w3c/ServiceWorker] Editorial: tidy up cross-linking (#996)

- Removes various link defaults and anchors that are no longer necessary
- Fixes ECMAScript spec link
- Fixes "fire a simple event" to simply be "fire an event" per recent DOM spec changes
- Removes links for "trusted event" since that is longer defined; a follow-up will be needed for that cleanup in general

This is a mergeable version of #995.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/996

-- Commit Summary --

  * Editorial: tidy up cross-linking

-- File Changes --

    M docs/index.bs (172)
    M docs/index.html (243)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/996.patch
https://github.com/w3c/ServiceWorker/pull/996.diff

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