Add pod blog

[merouanezouaid]

@kuwarkapur and I have worked on the issue https://github.com/MLH-Fellowship/prep-portfolio-22.JUL.PREP.1/issues/7 , we have added the blog section as well as styling the posts cards and the blog pages.

• [x] My Pod Leader knows I'm working on this Pull Request
• [x] I've explained what the Pull Request is adding.
• [x] I've explained why this is important.

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