Update and rename rfp-proposal-template1.md to rfp-proposal-Health_is…

[walywalid]

…_Wealth.md

[clairebiasco]

Hi there! We are officially moving all Halo Grant proposals to our new community forum page and will no longer be accepting proposals on GitHub. If you are still interested in pursuing this project, please resubmit your proposal to the community page here according to the provided template: https://community.iotex.io/c/halo-grants/61

Thank you!