Create a plugin and edition for tw5.com docs

By making the docs available as a plugin we make it easier for people
to fork their own copy of the docs without losing the ability to get
updates in the future (which can be done just be updating the docs
plugin)

editions/tw5.com-docs/tiddlers/DefaultTiddlers.tid

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+title: $:/DefaultTiddlers
+
+[[Improving TiddlyWiki Documentation]]

editions/tw5.com-docs/tiddlers/Improving TiddlyWiki Documentation.tid

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+title: Improving TiddlyWiki Documentation
+
+This edition of TiddlyWiki is a tool to help people make and submit improvements to the main documentation on http://tiddlywiki.com/
+
+In this wiki, all the tiddlers from http://tiddlywiki.com (to be precise, all the tiddlers [[from here|https://github.com/Jermolene/TiddlyWiki5/tree/master/editions/tw5.com/tiddlers]]) are packed into a plugin:
+
+[[$:/plugins/tiddlywiki/tw5.com-docs]]
+
+This means that the original documentation tiddlers become //shadow tiddlers//: if you edit them, you can just delete your modified copy to revert to the shadow value.
+
+Note that currently some functionality doesn't work properly because of macros and filters written expecting all the content tiddlers to be non-shadow tiddlers. For example, see [[Community]].
+
+''Default tiddlers from tiddlywiki.com'':
+
+<$macrocall $name="list-links" filter={{$:/tw5.com/DefaultTiddlers}}/>

editions/tw5.com-docs/tiddlers/external/tiddlywiki.files

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+{
+	"tiddlers": [
+		{
+			"file": "../../../tw5.com/tiddlers/system/DefaultTiddlers.tid",
+			"fields": {
+				"title": "$:/tw5.com/DefaultTiddlers"
+			},
+			"isTiddlerFile": true
+		}
+	]
+}

editions/tw5.com-docs/tiddlywiki.info

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+{
+	"description": "Documentation from tw5.com edition",
+	"plugins": [
+		"tiddlywiki/tw5.com-docs"
+	],
+	"themes": [
+		"tiddlywiki/vanilla",
+		"tiddlywiki/snowwhite"
+	],
+	"build": {
+		"index": [
+			"--rendertiddler","$:/core/save/all","index.html","text/plain"]
+	}
+}

plugins/tiddlywiki/tw5.com-docs/files/tiddlywiki.files

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+{
+	"directories": [
+		"../../../../editions/tw5.com/tiddlers"
+	]
+}

plugins/tiddlywiki/tw5.com-docs/plugin.info

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+{
+	"title": "$:/plugins/tiddlywiki/tw5.com-docs",
+	"description": "Documentation from tiddlywiki.com",
+	"author": "JeremyRuston",
+	"core-version": ">=5.0.0",
+	"list": ""
+}