Add bridging example to the Lit developer docs

[a1ttech]

Using the Yacht-Lit-SDK as a starting point, add an example to the Lit developer docs that demonstrates how PKPs and Lit Actions can be used to bridge assets across-chain. You should be using the Lit SDK V3 for this project.

Please submit a PR to add this work to the 'Integrations' section of the docs by creating a new category for bridging: https://developer.litprotocol.com/v3/integrations/

Please keep in mind that the Lit network is still in testnet and storing assets with real world value IS NOT RECOMMENDED at this time.