New release v4.0.0

[Rajat Paharia]

Hi all - 

We've made some changes on positioning and pricing: 

• Changed "Tools" to "Agents"
• Changed the plans and pricing model. You can BYO LLM Account and use all the capabilities of Ask Steve for Free, or purchase Credits from us as you need them and we'll send your requests to a model for you. In either case you can use all of Ask Steve's capabilities. There are no longer any subscriptions or a Premium plan. See https://asksteve.to/docs/plans for details.
• Removed the separate extension for Microsoft Edge. Edge users can install Ask Steve from the Chrome Web Store.

- rajat