Make some editions use external core

[Leilei332]

This would make visiting https://tiddlywiki.com faster.

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[Jermolene]

Hi @Leilei332 historically, the file at the URI https://tiddlywiki.com/index.html serves both as the home page and as a distribution URL for people to download TiddlyWiki. I'd have no objection to externalising the core for other wikis such as https://tiddlywiki.com/dev or https://links.tiddlywiki.org or https://mws.tiddlywiki.com etc

[pmario]

@Leilei332 -- It seems empty-js is not built otherwise there should be a tiddlywiki.com/external-5.3.6.html which you should be able to load.

TiddlyWiki5/editions/tw5.com/tiddlywiki.info

Lines 55 to 57 in 4478f44

	"external-js": [
	"--render","$:/core/save/offline-external-js","[[external-]addsuffix<version>addsuffix[.html]]","text/plain",
	"--render","$:/core/templates/tiddlywiki5.js","[[tiddlywikicore-]addsuffix<version>addsuffix[.js]]","text/plain"],

So imo the build system would need to be fixed -- It seems

[Leilei332]

@Leilei332 -- It seems empty-js is not built otherwise there should be a tiddlywiki.com/external-5.3.6.html which you should be able to load.

TiddlyWiki5/editions/tw5.com/tiddlywiki.info

Lines 55 to 57 in 4478f44

	"external-js": [
	"--render","$:/core/save/offline-external-js","[[external-]addsuffix<version>addsuffix[.html]]","text/plain",
	"--render","$:/core/templates/tiddlywiki5.js","[[tiddlywikicore-]addsuffix<version>addsuffix[.js]]","text/plain"],

So imo the build system would need to be fixed -- It seems

This is because the external-js build task isn't included in build-site.sh:

But I think we needn't add it back. While building the empty edition, its emptyexternalcore task is included, which builds https://tiddlywiki.com/empty-external-core.html