chore: get working again on chrome and ready to distribute unpacked (#69)

Organize the plugin for submission, and restore its operation on Chrome. Unfortunately GeoGebra's files block submission, so further work will be needed to create a plugin installer.

Reviewed-on: #69
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>

etc/manifest.json

@@ -1,7 +1,7 @@
 {
    "manifest_version": 3,
    "name": "archematics",
-   "version": "1.0",
+   "version": "<<FROM_PACKAGE_JSON>>",
 
    "description": "unearths mathematical treasures lost in the web",
    "icons": {
@@ -11,6 +11,12 @@
    },
    "author": "Glen Whitney <glen@archematics.app>",
    "homepage_url": "https://archematics.app",
+   "browser_specific_settings": {
+       "gecko": {
+         "id": "{8b22a3b8-57f1-45f4-8e87-9043115a8093}",
+         "update_url": "https://archematics.app/updates.json"
+      }
+   },
    "content_scripts": [
       {
          "matches": ["*://*/*"],
@@ -40,6 +46,7 @@
          "deps/x_ite/assets/components/KeyDeviceSensor.js",
          "deps/x_ite/assets/components/Scripting.js",
          "deps/x_ite/assets/components/Text.js",
+         "deps/x_ite/assets/images/logo.128.png",
          "adapptlet.js",
          "adapptypes.js",
          "conway.js",

etc/options.html

@@ -76,6 +76,7 @@
   <br/>
   <label for="algebra">Show the GeoGebra algebra pane</label>
   <input type="checkbox" id="algebra">
+  <script src="browser-polyfill.js" type="module"></script>
   <script src="options.js" type="module"></script>
 </body>