Filter CNCF Reference Architectures by Project

[caniszczyk]

https://architecture.cncf.io/architectures/?all=true

Now that reference architectures will be used by the TOC to help augment adopter interview requirements: cncf/toc#2256 (comment) , we should have the ability to filter them by projects

[castrojo]

I added this to the prototype of an end user site: we copy the Landscape's categories - I'm not a UX guy so happy to change this to whatever we like:

I can add this to the prod site but is it ok for me to just go in there and agent it up?