chore: simplify directory structure

package.json

@@ -5,12 +5,12 @@
     "web-ext": "web-ext",
     "watch:webextension": "unset WEB_EXT_API_KEY WEB_EXT_API_SECRET && web-ext --browser-console --start-url https://developer.mozilla.org/en-US/Add-ons/WebExtensions/web-ext_command_reference --start-url https://www.mozilla.org/en-US/contribute/ --start-url https://stats.stackexchange.com/questions/235528/backpropagation-with-softmax-cross-entropy --source-dir dist --artifacts-dir dist/web-ext-artifacts run",
     "watch:js": "webpack --watch --progress",
-    "watch:assets": "cpx 'src/{icons/*,manifest.json}' dist --watch",
+    "watch:assets": "cpx 'src/{icons/*.svg,manifest.json}' dist --watch",
     "prewatch": "npm-run-all generate-icons copy-assets",
     "watch": "npm-run-all --parallel watch:*",
     "webpack": "webpack",
     "generate-icons": "node src/icons/generate.js",
-    "copy-assets": "cpx 'src/{icons/*,settings/*,manifest.json}' dist",
+    "copy-assets": "cpx 'src/{icons/*.svg,settings.html,manifest.json}' dist",
     "prebuild": "npm-run-all generate-icons copy-assets webpack",
     "build": "unset WEB_EXT_API_KEY WEB_EXT_API_SECRET WEB_EXT_FIREFOX && web-ext --source-dir dist --artifacts-dir dist/web-ext-artifacts build",
     "postbuild": "unset WEB_EXT_FIREFOX && web-ext --source-dir dist --artifacts-dir dist/web-ext-artifacts sign --api-key $WEB_EXT_API_KEY --api-secret $WEB_EXT_API_SECRET",

src/manifest.json

@@ -11,7 +11,7 @@
     "scripts": ["index.js"]
   },
   "options_ui": {
-    "page": "settings/settings.html",
+    "page": "settings.html",
     "browser_style": true
   },
   "permissions": ["<all_urls>", "activeTab", "clipboardWrite", "contextMenus", "tabs", "storage"],

webpack.config.js

@@ -3,7 +3,8 @@ module.exports = {
   devtool: "source-map",
   entry: {
     index: "./src/index.js",
-    copy: "./src/copy.js"
+    copy: "./src/copy.js",
+    options: "./src/options.js"
   },
   output: {
     path: __dirname + "/dist",