Fix: Redesign Questions card, Prev/Next cards

[VishalPainjane]

What has changed?

Fixes keploy/keploy#3857

This PR redesigns several sidebar and footer elements to improve the UI consistency and fix broken navigation, addressing the issues listed in #3657.

Summary of changes:

1. Enterprise-ready bar: Fixed the broken link that was previously double-prefixed (changed from /docs/keploy-explained/why-keploy/ to /keploy-explained/why-keploy/).
2. "Questions?" Component: Completely redesigned the oversized card into a slim, dense support strip. It now features a cleaner flex-row layout with clear "Join Slack" and "Book a Demo" buttons, removing the excessive emojis and paragraph text.
3. Prev/Next Navigation: Updated the DocPaginator component to reduce padding (p-3), font sizes, and whitespace (mt-6), making the navigation cards significantly more compact and aligned with the theme.
4. Footer Divider: Added a visible <hr /> divider with proper vertical spacing (my-8) between the documentation content/pagination and the footer to create a clear visual break.

This PR Resolves #3657

Type of change

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Documentation update (if none of the other choices apply).

How Has This Been Tested?

I have verified the changes locally by running the development server.

1. Broken Link Verification: Checked the "Keploy vs traditional testing tools" card on the homepage to ensure it correctly navigates to the "Why Keploy?" page.
2. UI Verification: Verified the layout of the new "Have questions?" strip and the compact Prev/Next buttons at the bottom of documentation pages.

Screenshots:

• Before:

• After:

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.