Add Semester 5 IoT course with 2 Modules

[Divss72]

Related Issue

Fixes #63

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Description

This PR integrates the first two modules of the Semester 5 Internet of Things (IoT) course:

• Module 1: Introduction to IoT (Notes, schematics, and Arduino IDE setup)
• Module 2: Sensors & Actuators (PIR sensor details, hardware wiring, and troubleshooting instructions

[vercel]

@Divss72 is attempting to deploy a commit to the PushkarScripts Team on Vercel.

A member of the Team first needs to authorize it.

[Divss72]

@pushkarscripts please check all conflicts are resolved

[pushkarscripts]

A few important issues still remain in this PR before it can be reviewed further:

• You were asked to keep the contribution limited to 1 chapter (or at most 2–3 chapters) per PR for easier reviewability, but this PR still includes all previous markdown files/modules again.

• Several components are not following the latest styling/UI structure currently used in the project. For example, the sidebar styling and layout are visually inconsistent with the updated design system and responsiveness expectations.
  

• Some older UI patterns and component structures have been reintroduced instead of following the newer shared styles/components already present in the repository.

• Please sync your implementation with the current project structure and latest CSS conventions before requesting another review.

Right now this PR is too large and mixes content + UI refactors together, which makes proper reviewing difficult. Please split the work into smaller focused PRs and update the UI implementation accordingly.