moving canvas_note_share to src/share and add routes

src/share/canvas_note_share.js

@@ -1,4 +1,10 @@
-// const {elements, appState, files} = window.triliumExcalidraw;
+/**
+ * this is used as a "standalone js" file and required by a shared note directly via script-tags
+ * 
+ * data input comes via window variable as follow
+ * const {elements, appState, files} = window.triliumExcalidraw;
+ */
+
 document.getElementById("excalidraw-app").style.height = appState.height+"px";
 
 const App = () => {

src/share/content_renderer.js

@@ -114,7 +114,7 @@ document.addEventListener("DOMContentLoaded", function() {
             <div id="excalidraw-app"></div>
             <hr>
             <a href="api/images/${note.noteId}/${note.title}?utc=${note.utcDateModified}">Get Image Link</a>
-            <script src="../../libraries/excalidraw/canvas_note_share.js"></script>
+            <script src="./canvas_note_share.js"></script>
         </div>`;
     }
     else {

src/share/routes.js

@@ -1,3 +1,6 @@
+const express = require('express');
+const path = require('path');
+
 const shaca = require("./shaca/shaca");
 const shacaLoader = require("./shaca/shaca_loader");
 const shareRoot = require("./share_root");
@@ -55,6 +58,8 @@ function register(router) {
         });
     }
 
+    router.use('/share/canvas_note_share.js', express.static(path.join(__dirname, 'canvas_note_share.js')));
+
     router.get(['/share', '/share/'], (req, res, next) => {
         shacaLoader.ensureLoad();