fix: GradientFillButton using only Tailwind

[epoll31]

Description

I re-implemented the GradientFillButton using only Tailwind

Related Issue

Fixes #157

Proposed Changes

• changed src/showcase/components/button/GradientFillButton.tsx to only use tailwind

Screenshots

https://github.com/Ansub/SyntaxUI/assets/16091805/50a984a8-974b-410e-9562-36ab86387218

Checklist

Please check the boxes that apply:

• [x] I have tested the changes locally
• [x] I ran npm run build and build is successful
• [x] I have added necessary documentation (if applicable)
• [x] I have updated the credits.md file (if applicable)

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Name	Status	Preview	Comments	Updated (UTC)
syntax-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 6, 2024 5:50pm

[Ansub]

also can you remove usingFramer from src/app/docs/components/button/gradient-fill-button/page.mdx