Add gradient colors in colors tab

[RizkyRajitha]

Contributing Guidelines pull request Making a pull request

Guidelines

• I read the Contributing Guidelines

This pull request regarding on

• fixed an issue
• developed new feature
• fixed a bug

Briefly describe what you did

Appreciate your contribution to making Linkin better 🚀.

[vercel]

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🔍 Inspect: https://vercel.com/rajithagunathilake/linkin/GcVPEdEPSajY6oFT2NbTZoKeLpx6
✅ Preview: https://linkin-git-addgradientcolors-rajithagunathilake.vercel.app

[codecov-commenter]

Codecov Report

Merging #47 (272edb6) into dev (0f6e560) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #47   +/-   ##
=======================================
  Coverage   72.52%   72.52%           
=======================================
  Files           3        3           
  Lines          91       91           
  Branches       18       18           
=======================================
  Hits           66       66           
  Misses         21       21           
  Partials        4        4           

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