Improve docs clarity and usability

This PR improves Juno's documentation, enhancing the structure, navigation, and user experience. Below is a list of the tasks completed:

[x] Build a script to extract Juno’s config from the codebase generate-config.js
[x] Integrate the script to generate the config table and embed it in the docs automatically
[x] Add a locally indexed search bar with https://github.com/easyops-cn/docusaurus-search-local
[x] Migrate Docusaurus from v2 to v3: https://docusaurus.io/docs/migration/v3
[x] Organise versioning and include instructions in the README
[x] Organise the footer (add blog, release notes, config links)
[x] Remove the autogenerated sidebar and map it manually
[x] Change the docs font to MD Sans (Juno’s brand secondary font)
[x] Rewrite the Juno Configuration guide and include environment variables instructions
[x] Rewrite the Database Snapshots guide
[x] Rewrite the Hardware Requirements guide and increase minimum storage to 250GB
[x] Rewrite the Running Juno on GCP guide with updated screenshots
[x] Create a Juno intro page
[x] Create a Frequently Asked Questions (FAQ) page
[x] Create a Running Juno guide
[x] Rewrite the Updating Juno guide
[x] Create an Interacting with Juno guide (JSON-RPC and WebSocket)
[x] Reference the Starknet API reference and request builder
[x] Create a Monitoring Juno guide
[x] Update snapshot to block 640855
[x] Implement feedback from the cairo-native team

NethermindEth / juno