This is our own extension, so it belongs on the channel the operator key
signs — theseus.x/extensions/docx-editor/ — alongside screenshot, aegis and
pdf-editor. The community catalogue is for extensions published by whoever
owns a BNS name, and routing ours through it would have meant asking a name
owner to vouch for code we wrote.
Drops the community packing script: with one channel there is one publish
path, and it is the one already written down in docs/ADDON-UPDATES.md.
Worth stating plainly, because it is currently true and awkward: Settings
can only *install* from the community catalogue. An extension that is
neither bundled nor catalogued has a working update channel and no way for
anyone to get the first copy. Either it goes back into the build or it needs
a first-party entry point.
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