docs: write FAQ and organize gitbook directories (#157)

* chore: add gitbook config

* docs: add FAQ

* docs: move FAQ to about-yab directory

* docs: add SUMMARY.md

* docs: rename FAQ title

* docs: sort FAQ sections

* docs(about_yab): grammar update

* docs(about_yab): grammar update on cost section

* docs(faq): fix markdown lint
docs: edit supported sections zksync paragraph
docs: add x next to twitter and mention it is a group in telegram link

* docs(summary): update links and run lint

---------

Co-authored-by: Gian <[email protected]>

.gitbook.yaml

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+root: ./docs/

docs/SUMMARY.md

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+# Summary
+
+## About YAB
+
+* [❓ FAQ](about_yab/FAQ.md)
+
+## Links
+
+* [Telegram Group](https://t.me/grindlabs)
+* [Twitter/X](https://twitter.com/yanotherbridge)

docs/about_yab/FAQ.md

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+# FAQ
+
+## What is YAB?
+
+Yet Another Bridge (YAB) is the cheapest, fastest and most secure bridge
+solution from Starknet to Ethereum.
+
+## What makes YAB different from other bridge solutions?
+
+Bridges are generally insecure and economically inefficient. They exhibit an
+asymmetry between users and bridge operators, where users can easily lose funds.
+We propose a bridge design that is simple, modular, and utilizes multi-storage
+proofs and the native messaging system between Ethereum and Layer 2 networks
+(L2s) as a fallback mechanism.
+
+## How much time does it take to bridge?
+
+From the user's perspective, the bridging is completed in less than 30 seconds,
+as quickly as the time it takes the market maker to observe the user's deposit
+and execute a transfer.
+
+From the market maker’s perspective, they will be able to receive back the money
+after paying the user and sending a message using the native messaging system.
+It takes less than 30 seconds, due to the time it takes to make a transaction
+in Ethereum and the L2’s sequencer receiving the message.
+
+Storage proofs are also implemented but they are not in use because they are useful to
+scale and bridge from multiple L2 chains. This normally takes between 5 and 15
+minutes.
+
+## How much does it cost to bridge?
+
+The base cost of YAB is similar to an ERC20 transfer plus the cost of proving the state of the L1 and L2. Therefore, the bridge's final cost would be approximately $15.
+
+## What chains are currently supported?
+
+Currently, Starknet is the only supported chain.
+
+We are working on integrating ZkSync in the near future...
+
+## How can I get in touch with the team?
+
+You can contact us in:
+
+- [Telegram Group](https://t.me/grindlabs)
+- [Twitter/X](https://twitter.com/yanotherbridge)