Fix broken link for Learn Git & Github category

[AmirKarma]

Description

I changed the broken link for 'Learn Git & GitHub' in the category section to the correct link.

Category

• [ ] Documentation
• [ ] Resource Addition
• [x] Codebase
• [ ] User Interface
• [ ] Feature Request

Related Issue

Fixes #379

Checklist

• [x] I have gone through the CONTRIBUTING guide
• [x] The name of the resource is spelled correctly (if applicable)
• [x] The link to the resource is working (if applicable)
• [x] The resource is added in the correct format (if applicable)
• [x] I have tested changes on my local computer (if applicable)

[netlify[bot]]

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