Upgrade to Webpack 5 (#83)

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/83
Co-authored-by: Zoë Bijl <code@moiety.me>
Co-committed-by: Zoë Bijl <code@moiety.me>

config/webpack/shared.js

@@ -72,7 +72,7 @@ module.exports = {
     splitChunks: {
       cacheGroups: {
         default: false,
-        vendors: false,
+        vendorsVendors: false,
         common: {
           name: 'common',
           chunks (chunk) {
@@ -84,7 +84,8 @@ module.exports = {
         },
       },
     },
-    occurrenceOrder: true,
+    chunkIds: 'total-size',
+    moduleIds: 'size'
   },
 
   module: {
@@ -127,10 +128,4 @@ module.exports = {
   resolveLoader: {
     modules: ['node_modules'],
   },
-
-  node: {
-    // Called by http-link-header in an API we never use, increases
-    // bundle size unnecessarily
-    Buffer: false,
-  },
 };