🔹[EPIC] Create Figures for all Docs

[gagdiez]

Description

Many times, an image is worth a thousand words. Our documentation is clearly lacking figures and info-graphics to help us guide our users.

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Goal

Ideally, all complex topics are accompanied by a figure explaining it. A non exhaustive list is:

• On-boarding / Overview pages
• Topics around NEAR Account (e.g. creation, usage, keys, signatures, sub-accounts, transfers, etc)
• How the network works
• In which context each tool (e.g. RPC, API, SDK, etc) are used.
• Topics around smart contracts (e.g. XCC, state, init method, etc)

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### Related Issues
- [ ] Issue 1: Populate Issues