Fix: Correct misspelled variable in Tailwind config for AnimatedShinyText component (#362)

[notREKASH]

This PR resolves issue #362, where the custom animation for the AnimatedShinyText component was not working due to a misspelled variable in the tailwind.config.js file in documentation.

Changes:

• Renamed the CSS variable --shimmer-width to --shiny-width in the tailwind.config.js to match the variable used in the AnimatedShinyText component.

Testing:

• Verified that the animation now works as expected after updating the variable.
• Ensured that the manual installation guide reflects the correct configuration.

Fixes #362

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[itsarghyadas]

LGTM ✅