feat: add roadmap section

[abdallahshaban557]

• feat: Add roadmap page with navigation links and update strong tag font weight.

[gemini-code-assist]

Summary of Changes

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This pull request introduces a comprehensive roadmap section to the documentation site, providing users with a clear vision of upcoming developments and strategic focus areas. It also includes minor styling adjustments to enhance the readability and visual hierarchy of emphasized text.

Highlights

• New Roadmap Page: A new 'Roadmap' page has been added to the documentation, outlining the future plans and strategic directions for Genkit.
• Navigation Integration: The new roadmap page is now accessible via a navigation link in the main header and an entry in the documentation sidebar.
• Styling Update: The font weight for strong HTML tags has been increased for better visual emphasis.

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[gemini-code-assist]

Code Review

This pull request introduces a new '2026 Genkit Roadmap' document, making it accessible via the main navigation and the documentation sidebar. Additionally, it updates the font-weight for strong HTML elements from 500 to 700. The review feedback focuses on improving the newly added roadmap document by addressing minor inconsistencies in punctuation, correcting a typo ('Github' to 'GitHub' and 'seperate' to 'separate'), and refining Markdown formatting by removing redundant bolding from headings.