Change <div> part of certificate to <p>

add certificate of course 6-7-8-9

change html format

Apply dark theme to GitHub Pages site

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Update & Add Link courses 1,2,3 and 4

Add QA Final Exam for the Course.md

Create Final Exam for the Course.md

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add QA Peer-graded Assignment: Final Assignment-Part 3.md

Create Peer-graded Assignment: Final Assignment-Part 3.md

Add QA Final Assignment Part 3 Excel Basic Data Analysis.md

Create Final Assignment Excel Basic Data Analysis.md

Create README.md

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