This patch adds a --version and a --help flag

--version
radicle-httpd pre-release (b68ea537)

--help
Usage

   radicle-httpd [<option>...]

Options

    --listen       <address>         Address to listen on (default: 0.0.0.0:8080)
    --alias, -a    <alias> <rid>     Provide alias and RID pairs to shorten git clone commands for repositories,
                                     e.g. heartwood and rad:z3gqcJUoA1n9HaHKufZs5FCSGazv5 to produce https://seed.radicle.xyz/heartwood.git
    --cache        <number>          Max amount of items in cache for /tree endpoints (default: 100)
    --version, -v                    Print program version
    --help, -h                       Print help

Reword help message a bit

Some more rewording of help msg

Add some more output on start.

Also make it more like the other radicle rust crates

Add short flags to help msg

Add defaults to help msg

Improve verbosity