Mat/getting started improvements

[mwrites]

• Script for deployment to reduce a bit the steps
• Added an Explorer helper to handle urls (probably add this into the clockwork cli crate later, so it can also be used via the clockwork command)
• Clarified a bit the getting started so that people understand the workflow (why do I need a client and a program, how to observe and check that it works, etc.)

This getting started should just be enough for devs to run, test and get a feel of the workflow of deploying a transaction. More detailed walk-through will be included in docs.clockwork.xyz

I am doing the changes for one of the example first, so that it doesn't end up being a huge PR. Once we are set on the direction, I will either refactor the deploy script and readme into the root folder or maybe find another way later

(DO NOT MERGE) need to complete the 3 last sections of the README