docs: Add "NextAuth alternatives"

[lukiccd]

Related Issue

Link to the Github Issue created for this blog post

Link to Google Doc

TODO

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

• ...

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[jscyo]

Let's flesh out the pricing information a bit more, add some screen grabs from the providers and cite the sources

[jscyo]

Add pricing links. Also check that you are using the most up to date information/ valid information. Validate the information before it is submitted. Also please merge with master to resolve merge conflicts