Create distributables for Windows + Linux

[CollinsSpencer]

Problem

• This app needs to be packaged for both Windows + Linux and be set up for auto updating.
• Context: https://discord.com/channels/549281623154229250/1308862441450639431

Solution

• Use electron-builder to create these distributables, since electron-builder supports AppImage + auto-update on Linux.
• Still use Electron Forge for the Vite development.
• This PR creates the NSIS .exe for Windows and the .AppImage for Linux.
• This PR does not fully implement auto-updates.

[bcdrme]

These changes are looking good but I cannot run the generated AppImage on my machine (Fedora 41). It shows a white screen with the following error message in the terminal

(node:16549) electron: Failed to load URL: http://localhost:5173/ with error: ERR_CONNECTION_REFUSED

[bcdrme]

I've got it fixed 👍
see 41955aa