Added Common readme file

[karm-patel]

Description

• Added common_readme.md which contains notebook_name, colab link and github link

I am enlisting advantages of having this file just for recap:

1. Now we don't need firestore redirection, so adding a new notebook would be easy.
2. We don't need duplicate notebooks in separate folders which point to the root notebook.
   • Currently, we can remove book2 duplicate notebooks, but not book1 to maintain backward compatibility.
3. We don't need dummy notebooks like fig_10_9.ipynb anymore.
   • Again we can remove fig_x_y.ipynb from book2, but not book1

• There were some notebooks with identical content or either of them latexified and other is not. I've updated all such notebooks such that we will have only a single root notebook and other notebooks would have pointers to this root notebook.

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[karm-patel]

Dr. @murphyk, in which directory you will suggest putting common_readme.md?