Regex: Add an about section in editor

Adds a small helpful message in the editor and a link to regexr
for learning regex interactively.

Signed-off-by: kingbri <bdashore3@proton.me>

public/scripts/extensions/regex/editor.html

@@ -1,6 +1,15 @@
 <div id="regex_editor_template">
     <div class="regex_editor">
-        <h3><strong>Regex Editor</strong></h3>
+        <h3><strong data-i18n="Regex Editor">Regex Editor</strong>
+            <a href="https://regexr.com/" class="notes-link" target="_blank">
+                <span class="note-link-span">?</span>
+            </a>
+        </h3>
+
+        <small class="flex-container extensions_info">
+            Regex is a tool to find/replace strings using regular expressions. If you want to learn more, click on the ? next to the title.
+        </small>
+        <hr />
 
         <div class="flex-container flexFlowColumn">
             <div class="flex1">

public/scripts/extensions/regex/index.js

@@ -171,7 +171,6 @@ async function onRegexEditorOpenClick(existingId) {
 // Workaround for loading in sequence with other extensions
 // NOTE: Always puts extension at the top of the list, but this is fine since it's static
 jQuery(async () => {
-    console.log("REGEX CALLED")
     // Manually disable the extension since static imports auto-import the JS file
     if (extension_settings.disabledExtensions.includes("regex")) {
         return;