Create profile template and refactor new post method

[sweep-ai[bot]]

Description

This PR addresses two main tasks. First, it creates a new profile template (profile.html) to display the user's profile information. Second, it refactors the post() function in main.py to return all posts on a GET request and handle the creation of a new post on a POST request.

Summary of Changes

• Created a new file profile.html in the templates directory to display the user's profile information.
• Added a basic HTML structure with placeholders for the user's username and posts.
• Refactored the post() function in main.py to handle GET and POST requests appropriately:
  • If the request method is GET, the function now returns all posts.
  • If the request method is POST, the function handles the creation of a new post as before.

Please review and merge this PR. Thank you!

Fixes #16.

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