Connecting supertokens to db blog post

[rishabhpoddar]

Related Issue

• Connecting ST core docker image to MySQL / PostgreSQL #50

Link to Google Doc

Doing it in this PR directly

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

• Completion of all sections
• Linking of index to each section

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