[w3c/manifest] IDE (#943)

This commit implements a fully-automated development setup using Gitpod.io, an
online IDE for GitLab, GitHub, and Bitbucket that enables Dev-Environments-As-Code.
This makes it easy for anyone to get a ready-to-code workspace for any branch,
issue or pull request almost instantly with a single click.


Closes #???

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

* Breaks existing normative behavior (please add label "breaking")
* Adds new normative requirements
* Adds new normative recommendations or optional items
* Makes editorial changes (changes informative sections, or changes normative sections without changing behavior)
* Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] Firefox (link to issue)
* [ ] Edge (public signal)

If change is normative, and it adds or changes a member:

* [ ] [updated JSON schema](https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/web-manifest.json)

Commit message:

(Fill in. If making normative changes, describe exactly what the behavioral
difference will be.)

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change

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

  https://github.com/w3c/manifest/pull/943

-- Commit Summary --

  * Fully automate dev setup with Gitpod

-- File Changes --

    A .gitpod.Dockerfile (7)
    A .gitpod.yml (6)
    M README.md (2)

-- Patch Links --

https://github.com/w3c/manifest/pull/943.patch
https://github.com/w3c/manifest/pull/943.diff

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