[w3c/permissions] docs(contributing): improve the guidelines for changes (#106)

* Don't require updating index.html anymore, since deploy.sh does that.
* Suggest the Karma commit message format.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/106

-- Commit Summary --

  * docs(contributing): improve the guidelines for changes

-- File Changes --

    M contributing.md (14)

-- Patch Links --

https://github.com/w3c/permissions/pull/106.patch
https://github.com/w3c/permissions/pull/106.diff

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