fix: remove unused dependencies

fix: use println!() for success message

feat: switch to mnemonic for storing key data in human readable format

update: README.md

feat: add CLI arg to add public key to keystore

fix: print public key only when starting server

feat: use clap for parsing CLI args

fix: remove error!() usage

feat: add function to add a new trusted key

feat: print public key in CLI for easy sharing

fix: remove some usage of unwrap()

fix: remove useless String conversion

feat: only trust certs already specified in config

feat: add quinn-proto

update: flake.lock

feat: add gdb for dev shell

update: Cargo.lock

feat: add basic config file management and persistent key storage

fix: remove useless println

Add reliable file transfer with some basic auth

For this, a preshared secret is used. Simply pass it into the CLI
argument and see the magic happen!

Limitations:

- Only one file is being transferred
- You have to manually enter the IP:port
- No progress indicators