Minor changes to auto UI code generation

Replace outdated CSS in HTML by style.css import
Fix missing button double press in time settings
FIx missing meta utf-8 in WiFi and UI settings
Modify cdata.js to add an info header to the top of auto-generated files

tools/cdata.js

@@ -84,7 +84,14 @@ function writeHtmlGzipped(sourceFile, resultFile) {
 
       console.info("Compressed " + result.length + " bytes");
       const array = hexdump(result);
-      const src = `
+      const src = `/*
+ * Binary array for the Web UI.
+ * gzip is used for smaller size and improved speeds.
+ * 
+ * Please see https://github.com/Aircoookie/WLED/wiki/Add-own-functionality#web-ui
+ * to find out how to easily modify the web UI source!
+ */
+ 
 // Autogenerated from ${sourceFile}, do not edit!!
 const uint16_t PAGE_index_L = ${result.length};
 const uint8_t PAGE_index[] PROGMEM = {
@@ -153,7 +160,13 @@ ${result}
 }
 
 function writeChunks(srcDir, specs, resultFile) {
-  let src = "";
+  let src = `/*
+ * More web UI HTML source arrays.
+ * This file is auto generated, please don't make any changes manually.
+ * Instead, see https://github.com/Aircoookie/WLED/wiki/Add-own-functionality#web-ui
+ * to find out how to easily modify the web UI source!
+ */ 
+`;
   specs.forEach((s) => {
     try {
       console.info("Reading " + srcDir + "/" + s.file + " as " + s.name);