Add introduction article for quantum theory series

[SRIKALEESWARAR-S]

This article introduces quantum theory and computing, outlining the series' goals and the author's background. It discusses the significance of quantum mechanics and the upcoming topics to be covered.

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[xmnlab]

Thanks for the contribution! I think this needs changes before merge.

Main blockers:

1. Please add the referenced header.jpg/header.png image to the post directory, all post should have an image.
2. Fix the category typo: quamtum-theory → quantum-theory.
3. Unindent the “What Lies Ahead” items and AI-use note; currently they will render as code blocks.
4. Remove the body-level # title because the blog template already renders the front-matter title as the page H1.

A small editorial pass would also help, especially around the superposition explanation and heading grammar.

also ensure the "main" CI job passes. and maybe you will need to rebase your branch on top of the upstream main branch. you can find more information about git rebase here: https://opensciencelabs.org/blog/first-time-contributors/#understanding-merge-commit-vs-rebase-in-git