Optimized Book Loading, Linux Workaround...

[Changelog]
- Epubs are now loaded by URL instead of through invoke.
- This removes the need to serialize the bytes, and massively speeds up loading times.
- Because of a linux specific issue, documented below, a file server workaround will be used.

Main Issue:tauri-apps/tauri#3725
Fix Guide: tranxuanthang/lrcget@0a2fe99
See mention: tauri-apps/tauri#3725 (comment)

[Dependencies]
Added axum = "0.6.19"
Added tokio = { version = "1.29.1", features = ["full"] }
Added tower-http = { version = "0.4.3", features = ["fs", "cors"] }