Rebranding Cashtab app docs for SendLotus

Need to rebrand and deploy this for SendLotus: https://docs.cashtabapp.com/docs/

Migrated to https://gitlab.com/abcpros/sendlotus/-/wikis/home , need to update the link in the app to this link in gitlab.

Text for the welcome screen:

Current:

SendLotus is an open source, non-custodial web wallet for Lotus.

Want to learn more? Check out the SendLotus source code.

New (no link to the givelotus.org):

SendLotus is an open source, non-custodial web wallet for Lotus.

To start, install SendLotus to your device follow the guide.