docs: add link to CDK alternative

[blimmer]

This project has been really great and inspired my CDK translation of this repo, https://github.com/blimmer/cdk-static-wordpress. If you're open to it, I added an alternatives section to the README.

My project fixes at least: #80, #79, #70, #15, #19, #57, #24, #54, #51, #29, #35, #33, #31, #27, #23, #16