feat: switch discord RPC activity type to "Watching"

[tilda]

• Switches dependency from discord-rpc to @xhayper/discord-rpc
  • More recently maintained version that supports activity types (o7 to my patch method that was initially in this PR 💀)
• Adds the type field to the setActivity call in the main application file

Closes #185

[tilda]

~~(Will actually switch this to a modernized fork instead since it exists)~~ Done

[aleganza]

missed this one sorry. will check later if I have time

[waruhachi]

Implemented based on your PR into my fork here: https://github.com/waruhachi/akuse/releases/tag/1.15.0