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]

Please double check this pricing information to make sure it is accurate, a lot of providers regularly change their pricing so getting this information from sources like articles or chatgpt may give out of date or incorrect information

[jscyo]

I recently checked out Auth0's pricing and I know the following is out of date. Please double check this and the rest of the providers to make sure it is accurate. The team is also going to make changes to the previous articles we have posted about Auth0 pricing