Remove electron-devtools-installer, embed vue-devtools another way

[ShGKme]

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electron-devtools-installer is not maintained for years and currently doesn't work (MarshallOfSound/electron-devtools-installer#240). We use it to embed vue-devtools Chromium extension.

It works for users who run Nextcloud Talk Desktop in past - the extension is downloaded and installed into Electron and cached. But it doesn't on fresh install or after cleaning all the Electron data (e.g. AppData on Windows).

Alternatives:

• Use standalone version of vue-devtools. But it is no so convenient to use, especially in production mode.
• Use forks, for example, electron-devtools-assembler
• Embed vue-devtools itself into the application and install extension manually in Electron