Update index.md

[JoGetBlock]

add another RPC provider supporting ETH Chain

Description

Please include a summary of the changes and be sure to follow our Contribution Guidelines.

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] I have selected the correct base branch.
• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.
• [x] I have made corresponding changes to the documentation.
• [x] My changes generate no new warnings.
• [x] Any dependent changes have been merged and published in downstream modules.
• [ ] I ran npm run lint with success and extended the tests and types if necessary.
• [ ] I ran npm run test:unit with success.
• [ ] I ran npm run test:coverage and my test cases cover all the lines and branches of the added code.
• [ ] I ran npm run build and tested dist/web3.min.js in a browser.
• [ ] I have tested my code on the live network.
• [x] I have checked the Deploy Preview and it looks correct.
• [ ] I have updated the CHANGELOG.md file in the root folder.
• [ ] I have linked Issue(s) with this PR in "Linked Issues" menu.

[JoGetBlock]

Wanted to add another provider to the list

[jdevcs]

@SantiagoDevRel changes mentioned in this PR should be merged via new PR created by you.