restored images referenced in "20.Use-Emacs.md"

[AnweshGangula]

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[nobiot]

Hi @AnweshGangula
Thank you for your time and efforts to doing this.

Your PR has made me realise that I should have moved a bit more quickly.
You might have notice while recovering the images that the chapter 2 and 3 don't connect well at the moment.
I want to use the org files you create in chapter 2 for Org-roam in later chapters -- that was the structure in V1.
But... You can't for V2. The org files are not yet created with Org-id -- but it may be too early to introduce Org-id at this stage. Maybe it's fine... Not sure.

Because of this, I was thinking to combine chapter 2 and 3 in a single chapter -- this has been taking too long so far.

I really appreciate your efforts but I am hesitant to merge the whole PR.
I like to keep your "minor change" commit, though, to fix typos in my writing.

[AnweshGangula]

I understand, Thank you for letting me know.
And thank you for creating the guide