add vlsi and embedded systems docs

[ramyacm23]

Related Issue

Fixes #153

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Description

This PR adds a complete VLSI and Embedded Systems documentation module for Semester-7 and replaces the existing Coming Soon placeholder with actual study content.

The new module includes:

• Topic-wise structured notes for VLSI and Embedded Systems
• Chapters covering Introduction to VLSI, CMOS Technology, Digital IC Design, FPGA Basics, Embedded Systems Fundamentals, Microcontrollers and Processors, Arduino and Raspberry Pi Basics, Real-time Systems, and a Mini Projects/Resource Hub
• Practical examples, mini-project ideas, and textbook references
• External learning resources from NPTEL, Arduino, Raspberry Pi, and FPGA documentation
• Two lightweight SVG diagrams to improve conceptual understanding
• Navigation and routing consistent with other OpenCSE subject pages

It also updates the Semester-7 subjects section so VLSI and Embedded Systems is now accessible from the homepage.

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Type of Change

• Bug fix
• New feature
• Documentation update
• UI/UX improvement
• Refactor

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Screenshots / Demo

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How Has This Been Tested?

Tested locally by:

• Running npm install
• Running npm run lint
• Running npm run build

The new sem7/vlsi routes compiled successfully, and the build passed.
Lint completed successfully with only pre-existing warnings in unrelated files.

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Checklist

• My code follows the project structure and conventions
• I have tested the changes locally
• I have linked the related issue properly
• I have added screenshots where applicable
• No existing functionality was broken

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AI Usage

• I have not used AI tools for this contribution

• I have used AI tools (ChatGPT, Copilot, Claude, etc.) and I have reviewed, verified, and understood all generated code/content before submitting this PR

If AI tools were used, briefly explain how:

AI was used to help draft and structure the new documentation content, generate the initial code scaffolding for the Semester-7 VLSI module, and assist with organizing topic coverage, examples, and resource links. All changes were reviewed and validated locally before submission.

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Additional Notes

This PR focuses on providing a strong first version of the VLSI and Embedded Systems module in the same layout/style as other documented subjects in the repository.

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