fix: Add anchor to the blog post's headers

[sulha199]

Related Issue

• Blog improvements #5 good-to-have no.2

• anchor is only generated from markdown's headers.

• No anchor for h1 of the page's title

The cursor position in the below GIF is just not accurate

Link to Google Doc

NA

Checklist

• Has cover image been added
• Have all content images been added. Do they render correctly? (aspect ratio etc)
• The code inside code blocks gives no errors
• Check for SEO keyword?
• Added call to action to link to supertokens and to link to other blogs.
• Add reference to how SuperTokens solves this blog's problem (if relevant).

Remaining TODOs

NA

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