zkEVM User Guides 2 (#649)

* Update

- Add from Astar zkEVM to Astar EVM bridge
- Add from Astar zkEVM to Ethereum
- Add unstaking vASTR on Astar zkEVM
- Improve images

* Update ASTR-Liquid-Staking.md

* Update zkEVM-guides for JP (#648)

* Add DOT address

* Fix Jp translations

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Co-authored-by: tksarah <tsarah8139@gmail.com>
Co-authored-by: Megan Skye <58894568+meganskye@users.noreply.github.com>

Author: 3 people