Add RPC failover options

[Sliman4]

I thought about creating a new page for all failover options in all environments, but near-jsonrpc-client-rs doesn't have this feature, wallet-selector only has a feature request issue, couldn't find it in other packages, either, so I guess the providers page is a good place for this for now.

Also fixed a link on that page that didn't scroll to the highlighted content.

[frol]

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[Sliman4]

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Reviewer	Score
@bucanero	2

The average score is 2

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[bucanero]

Please check my comments. 👍

[race-of-sloths]

🔄 The PR has been merged.

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[bucanero]

@race-of-sloths score 2

[race-of-sloths]

🌟 Score recorded!

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[race-of-sloths]

✅ PR is finalized!

Your contribution is much appreciated with a final score of 2!
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