Add/update plugin readmes

Notice that translators need to translate the core plugin readme

plugins/tiddlywiki/browser-sniff/plugin.info

@@ -2,5 +2,6 @@
 	"title": "$:/plugins/tiddlywiki/browser-sniff",
 	"description": "Browser sniffing for TiddlyWiki",
 	"author": "JeremyRuston",
-	"core-version": ">=5.0.0"
+	"core-version": ">=5.0.0",
+	"list": "readme"
 }

plugins/tiddlywiki/codemirror/plugin.info

@@ -1,5 +1,6 @@
 {
 	"title": "$:/plugins/tiddlywiki/codemirror",
 	"description": "Codemirror plugin",
-	"author": "JeremyRuston"
+	"author": "JeremyRuston",
+	"list": "readme"
 }

plugins/tiddlywiki/codemirror/readme.tid

@@ -1,4 +1,4 @@
-title: $:/plugins/tiddlywiki/codemirror/instructions
+title: $:/plugins/tiddlywiki/codemirror/readme
 
 ! Setting ~CodeMirror Content Types
 

plugins/tiddlywiki/github-fork-ribbon/plugin.info

@@ -1,5 +1,6 @@
 {
 	"title": "$:/plugins/tiddlywiki/github-fork-ribbon",
 	"description": "GitHub-style ribbon in pure CSS",
-	"author": "Simon Whitaker, adapted for TiddlyWiki by JeremyRuston"
+	"author": "Simon Whitaker, adapted for TiddlyWiki by JeremyRuston",
+	"list": "readme"
 }

plugins/tiddlywiki/googleanalytics/plugin.info

@@ -2,5 +2,6 @@
 	"title": "$:/plugins/tiddlywiki/googleanalytics",
 	"description": "Google Analytics plugin for TiddlyWiki5",
 	"author": "JeremyRuston",
-	"core-version": ">=5.0.0"
+	"core-version": ">=5.0.0",
+	"list": "readme"
 }

plugins/tiddlywiki/highlight/plugin.info

@@ -1,5 +1,6 @@
 {
 	"title": "$:/plugins/tiddlywiki/highlight",
 	"description": "Highlight.js plugin for TiddlyWiki5",
-	"author": "JoaoBolila"
+	"author": "JoaoBolila",
+	"list": "license"
 }