Remove remainders of gemini-scrollbar and react-gemini-scrollbar

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

package.json

@@ -63,7 +63,6 @@
   "dependencies": {
     "browser-request": "^0.3.3",
     "favico.js": "^0.3.10",
-    "gemini-scrollbar": "github:matrix-org/gemini-scrollbar#91e1e566",
     "gfm.css": "^1.1.2",
     "highlight.js": "^9.13.1",
     "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",

src/vector/index.js

@@ -21,7 +21,6 @@ limitations under the License.
 // Require common CSS here; this will make webpack process it into bundle.css.
 // Our own CSS (which is themed) is imported via separate webpack entry points
 // in webpack.config.js
-require('gemini-scrollbar/gemini-scrollbar.css');
 require('gfm.css/gfm.css');
 require('highlight.js/styles/github.css');