chore(docs): update rainbowkit recommendation

[bakoushin]

Description

Update the links since Valora is now supported in rainbowkit and the rainbowkit-celo is sunset.

Test plan

Visual assessment

Related issues

Fixes #5983

Backwards compatibility

NA

Network scalability

NA

[jeanregisser]

Great! 🚀

Additionally we could/should probably link to https://github.com/valora-inc/dapp-list/blob/main/docs/adding-new-dapps.md#showing-valora-as-a-preferred-wallet which shows how to make sure Valora is part of the preferred wallets displayed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.73%. Comparing base (b39dbf8) to head (e217969).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6087      +/-   ##
==========================================
- Coverage   88.74%   88.73%   -0.01%     
==========================================
  Files         727      727              
  Lines       30772    30772              
  Branches     5614     5614              
==========================================
- Hits        27309    27306       -3     
+ Misses       3420     3268     -152     
- Partials       43      198     +155     

see 67 files with indirect coverage changes

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[bakoushin]

@jeanregisser thanks for the suggestion! addressed in valora-inc/dapp-list#669

Additionally we could/should probably link to https://github.com/valora-inc/dapp-list/blob/main/docs/adding-new-dapps.md#showing-valora-as-a-preferred-wallet which shows how to make sure Valora is part of the preferred wallets displayed.