Fix Readme with proper links and added some great stylings

[Developer-piyush]

Description I have fixed and added proper links to readme with Table of contents, Also added some symmetry styling to the whole content.

Metadata

• To see live results of fixed: head over to forked repo:
• https://github.com/Developer-piyush/optimism/blob/develop/README.md

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Latest commit: f11c10c4c368eee7d7342fdc163c13d61ac8193a

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[Developer-piyush]

:)