getCoreContentText for any websites using mozilla/readability (#641)

* getCoreContentText for any websites using https://github.com/mozilla/readability

* improve use of @mozilla/readability

---------

Co-authored-by: josc146 <josStorer@outlook.com>

package-lock.json

@@ -6,6 +6,7 @@
     "": {
       "name": "chatgptbox",
       "dependencies": {
+        "@mozilla/readability": "^0.5.0",
         "@nem035/gpt-3-encoder": "^1.1.7",
         "@picocss/pico": "^1.5.9",
         "@primer/octicons-react": "^18.3.0",
@@ -2077,6 +2078,14 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mozilla/readability": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@mozilla/readability/-/readability-0.5.0.tgz",
+      "integrity": "sha512-Z+CZ3QaosfFaTqvhQsIktyGrjFjSC0Fa4EMph4mqKnWhmyoGICsV/8QK+8HpXut6zV7zwfWwqDmEjtk1Qf6EgQ==",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/@nem035/gpt-3-encoder": {
       "version": "1.1.7",
       "resolved": "https://registry.npmjs.org/@nem035/gpt-3-encoder/-/gpt-3-encoder-1.1.7.tgz",