Description:
Currently, all blog posts on DevTools Academy display a static "8 min read" value regardless of the actual content length. This should be calculated dynamically based on each article's word count.

Acceptance criteria:

• Reading time should be calculated based on the actual content length of each post
• Use an average reading speed of 150-200 words per minute
• Round to the nearest minute
• Display as "X min read" where X is the calculated value
• Update both the blog listing cards and individual post pages

Additional notes:

• The calculation could be done at build/render time rather than on each page load
• Consider adding this data to the post metadata