Change navigation to new tab when clicking on Harnoor or Machine Learning course

PR Fixes:

• 1 Change navigation from same tab to new tab

Resolves #382

Only one file has been changed src/components/Courses.tsx

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I assure there is no similar/duplicate pull request regarding same issue

ScreencastNEWTAB.webm