Add GravityTextSwap component

[lappemic]

Added a new GravityTextSwap component.

What's new:

• Created gravity-text-swap.tsx with the GravityTextSwap component
• Updated animation-preview.tsx to show GravityTextSwap examples
• Added documentation for GravityTextSwap in gravity-text-swap.content.ts
• Updated side navigation to include GravityTextSwap
• Updated docs content configuration to include GravityTextSwap

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[nikhils4]

JUST WOW, loved the animation 😍