fix some text issues with grammar and style

[nett00n]

fix most common markdownlint violations

I have two questions:

• There are many inline HTML, which are not recommended. I would prefer to fix it before merging this pr.
• There are badges mentions in footer, but no badges themselves. Is it a bug or feature?

[Zehina]

Hey @nett00n thank you for these improvements. From a first look, all looks great .
So to answer your question:

• Some HTML is there for the centering I was using.
• The badges in the footer is a bug indeed and can be removed

I'm currently planning on merging #36 . Which changes the whole structure of the project
so woud you mind either:

• Porting your changes ta branch based on the new-structure branch and wait for it to merge first
• Or I can just review this and we can merge and I'll look into the conflicts myself.

Thank you again this is very helpful. But I figured I needed to do some very necessary cleanup first

[nett00n]

@Zehina I ported changes to new-structure branch. Here is PR

1. HTML usage in README.md minified
2. More linters added
3. black formatter for *.py added for more style and readability
4. everything I found had been fixed