Updated readme file with better design, less text

[ServiAmirPM]

Still requires more modeifications (results, features, tutorials)

Pull Request Description:

• Re-structure - changed the way the document is structured (table of content), including changing titles names
• Redesigned the header - with better look and feel, with as much information in the header.
• Removed tutorials from the tutorials section in the readme - will add some back after re-structuring the tutorials.
• Added visuals to the page for better look and feel, and to better explain the product.
• improved the quantization flow table and added 4 tutorials to it.
• Re-ordered the Resources section, making it clear that API is per quantization method
• Hidden (collapsed) the supported version table. users can open it on demand
• Supported features - didn't touch it - still needs work
• Quantization - didn't touch it - still needs work
• Results - removed text, still requires updating the numbers, add mixed percision and the update graph
• Toubleshooting and community - added community to this section.
• Updated the license section with text and a badge

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).

[ofirgo]

@ServiAmirPM
Please provide more details regarding the changes in the PR description (what are the main changes to the readme, what was added/removed, etc.), both for documentation and to make my review easier 😄