[w3c/manifest] changed some working links from http to https (#607)

other are not working with https or broken
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/607

-- Commit Summary --

  * changed some working links from http to https

-- File Changes --

    M CONTRIBUTING.md (13)
    M LICENSE.md (2)
    M explainer.md (4)
    M index.html (8)

-- Patch Links --

https://github.com/w3c/manifest/pull/607.patch
https://github.com/w3c/manifest/pull/607.diff

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