Add multiwikidocs edition and CI to build it

editions/multiwikidocs/tiddlers/DefaultTiddlers.tid

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+title: $:/DefaultTiddlers
+
+HelloThere

editions/multiwikidocs/tiddlers/HelloThere.tid

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+title: HelloThere
+
+Hello! This is a test

editions/multiwikidocs/tiddlywiki.info

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+{
+	"description": "Multiple wiki server documentation edition",
+	"plugins": [
+	],
+	"themes": [
+		"tiddlywiki/vanilla",
+		"tiddlywiki/snowwhite"
+	],
+	"build": {
+		"index": [
+			"--savetiddlers","[tag[external-image]]","images",
+			"--setfield","[tag[external-image]]","_canonical_uri","$:/core/templates/canonical-uri-external-image","text/plain",
+			"--setfield","[tag[external-image]]","text","","text/plain",
+			"--render","$:/core/save/all","index.html","text/plain"],
+		"favicon": [
+			"--savetiddler","$:/favicon.ico","favicon.ico"],
+		"static": [
+			"--render","$:/core/templates/static.template.html","static.html","text/plain",
+			"--render","$:/core/templates/alltiddlers.template.html","alltiddlers.html","text/plain",
+			"--render","[!is[system]]","[encodeuricomponent[]addprefix[static/]addsuffix[.html]]","text/plain","$:/core/templates/static.tiddler.html",
+			"--render","$:/core/templates/static.template.css","static/static.css","text/plain"]
+	}
+}