Shailesh Kumar

feat: tests to run on GitHub Actions (#2576)

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## Fixes issue This PR fixes the following issues: closes #2576

Fixes issue #391

Added Friends theme in THEMES.md

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Added Friends theme.

**Is your feature request related to a problem? Please describe.** I think it'll be good if add a direct link to the Github repo of "tabsMonster" and other social links...

I've made some changes in navbar and changes the UI of Download Button 

Enhancement in Navbar of the landing page of tabsMonster

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**Is your feature request related to a problem? Please describe.** I think it looks good if we can make the background color of the navbar black and enhance the navbar...