[Docs] Generate and Deploy DocC to GH pages

[radeknovis]

On push to main branch deploy_pages.yml workflow is going to be run. Executing the generate_docs.sh and then triggers deployment of github pages, deploying static site generated in docs directory

generate_docs.sh:

Runs swift package generate-documentation for each target defined in Package.swift. Currently there is no support for multiple targets so we are storing produces files in temporary folders and merging these folders in next steps, including generating root index.html allowing to navigate to docs for individual targets as seen here
https://walletconnect.github.io/WalletConnectSwiftV2/

Specific target documentation can be the found on following url
https://walletconnect.github.io/WalletConnectSwiftV2/documentation/${ TARGET_NAME.allLowerCased } e.g. https://walletconnect.github.io/WalletConnectSwiftV2/documentation/walletconnectsign/