examples: fix and improve init script

[StalkR]

What are the changes and their implications?

Fix the example init script that doesn't work on debian 12, with droppy installed with npm install -g @droppyjs/cli.

What I changed to fix and improve it so it works better:

• args -c and -f are not read because of -- and it falls back to the ~/.droppy default
• process isn't droppy but @droppyjs/cli so it doesn't match
• use a pid file instead, more reliable

Checklist

• [ n/a ] Changes covered by tests (tests added if needed)
• [ n/a ] PR submitted to droppyjs.com for any user facing changes

Thanks for the fork and maintaining it <3

[markhughes]

Thanks for the improvement!