fix npm start assets

[rom1504]

they don't work (very likely caused by #227)
cc @Saiv46

[rom1504]

short term solution will be a revert of 8c88ec6

[rom1504]

ERROR in ./node_modules/jose/dist/browser/runtime/env.js 6:15-22
Module not found: Error: Can't resolve 'process/browser' in '/workspace/prismarine-web-client/node_modules/jose/dist/browser/runtime'
Did you mean 'browser.js'?
BREAKING CHANGE: The request 'process/browser' failed to resolve only because it was resolved as fully specified
(probably because the origin is strict EcmaScript Module, e. g. a module with javascript mimetype, a '*.mjs' file, or a '*.js' file where the package.json contains '"type": "module"').
The extension in the request is mandatory for it to be fully specified.
Add the extension to the request.
resolve 'process/browser' in '/workspace/prismarine-web-client/node_modules/jose/dist/browser/runtime'
  Parsed request is a module
  using description file: /workspace/prismarine-web-client/node_modules/jose/dist/browser/package.json (relative path: ./runtime)
    Field 'browser' doesn't contain a valid alias configuration
    resolve as module
      /workspace/prismarine-web-client/node_modules/jose/dist/browser/runtime/node_modules doesn't exist or is not a directory
      /workspace/prismarine-web-client/node_modules/jose/dist/browser/node_modules doesn't exist or is not a directory
      /workspace/prismarine-web-client/node_modules/jose/dist/node_modules doesn't exist or is not a directory
      /workspace/prismarine-web-client/node_modules/jose/node_modules doesn't exist or is not a directory
      /workspace/prismarine-web-client/node_modules/node_modules doesn't exist or is not a directory
      looking for modules in /workspace/prismarine-web-client/node_modules
        existing directory /workspace/prismarine-web-client/node_modules/process
          using description file: /workspace/prismarine-web-client/node_modules/process/package.json (relative path: .)
            using description file: /workspace/prismarine-web-client/node_modules/process/package.json (relative path: ./browser)
              Field 'browser' doesn't contain a valid alias configuration
              /workspace/prismarine-web-client/node_modules/process/browser doesn't exist
      /workspace/node_modules doesn't exist or is not a directory
      /node_modules doesn't exist or is not a directory
 @ ./node_modules/jose/dist/browser/runtime/asn1.js 1:0-57 44:14-33 44:39-47 47:13-21 104:14-33 104:39-47
 @ ./node_modules/jose/dist/browser/key/export.js 1:0-60 2:0-62 5:11-23 8:11-24
 @ ./node_modules/jose/dist/browser/index.js 21:0-69 21:0-69 21:0-69 21:0-69
 @ ./node_modules/prismarine-auth/src/TokenManagers/XboxTokenManager.js 8:22-37
 @ ./node_modules/prismarine-auth/src/MicrosoftAuthFlow.js 11:25-68
 @ ./node_modules/prismarine-auth/index.js 8:12-46
 @ ./node_modules/minecraft-protocol/src/client/microsoftAuth.js 2:37-63
 @ ./node_modules/minecraft-protocol/src/createClient.js 10:22-55
 @ ./node_modules/minecraft-protocol/src/index.js 6:21-46
 @ ./node_modules/mineflayer/lib/loader.js 1:11-40
 @ ./node_modules/mineflayer/index.js 7:0-43
 @ ./index.js 18:19-40

after reverting that commit

so we need to fix jose as well...