README improvements (kaspanet#321)

* README.md reformatted + logo

Added a logo and cleaned up the formatting for README.md for repo to look more appealing.

* Added table of contents

* Categorized README.me

* Removed confusing node setup

* Formatting

* Added language tag markdown

* Removed duplicate file

* kaspanet#321 - Refactored documentation

I have refactored the documentation and made the following changes:

* Wrapped most sections in <details> tag.
* Added multi-line code representation.
* Removed image.
* Prefixed linux commands with `sudo`

Co-Authored-By: coderofstuff <[email protected]>

* kaspanet#321 - Added a few more backslashes

Added backslashes to linux commands.

* Refactoring to reduce the amount of details tags used

* Removed detail tags

* Removed details tag from nextest and integration tests section

* Added introduction paragraph.

* Updated wording

* Rephrased sentence

* Refactored readme

I have made the following modifications:
* rephrased text
* removed heading alignment
* removed p2 and p3
* made linux general prerequisites in a single line

* Delete kaspa.png

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Co-authored-by: coderofstuff <[email protected]>
Co-authored-by: aspect <[email protected]>