[w3c/manifest] Merges the explainer into the readme.md (PR #1246)

Closes #1010 
This change (choose at least one, delete ones that don't apply):

* Is a "chore" (metadata, formatting, fixing warnings, etc).

Commit message:

Merges the explainer into the readme file. As @marcoscaceres states, "one less click".

I have added missing information in 2 TBW sections: colours, internationalisation and the description field.

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1246

-- Commit Summary --

  * Merges the explainer into the readme.md

-- File Changes --

    M README.md (306)
    D explainer.md (294)

-- Patch Links --

https://github.com/w3c/manifest/pull/1246.patch
https://github.com/w3c/manifest/pull/1246.diff

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