Add a readme and provide misc improvements

[johnalotoski]

Overview:

Adds a readme and provides miscellaneous improvements, systemd service optimization, template alert tuning, template sql query fix and updates packages.

Details:

• Add a readme
• Update wallet and dbsync-ng package versions
• Template: Fixes a pool analysis query which was sometimes including already de-delegated pools in the result
• Template: Increase rejected block sensitivity alert for cardano-node
• Fix a race condition causing cardano-node systemd service to fail occasionally after machine reboot on block producers
• Optimize: reduce cardano-node systemd startup time due local socket sharing via postStart script; use inotifywait instead