Add modern tech stack to build a SaaS

[ixartz]

Issue #, if available:

Description of changes:

• Add a new post about modern tech to build SaaS

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ixartz]

Hi @dabit3 , could review this PR ? Thank you in advance.

PS: I see also several PRs waiting for review.

[aspittel]

Hey @ixartz, sorry for the slow response on this - the project is no longer being maintained but will be replaced with something new soon. Thank you so much for writing about amplify and being a member of the community!