Walrus Rayleigh Taylor Instability (RTI) blog (#13)

* fixed date

* walrus rti blog stuff

* Add Walrus RTI blog post

* tweak blog post

* tweak blog post

* tweak blog post

* tweak blog post

* tweak blog post

* tweak blog post

* add sim-to-real image

* add a comment on transient

* tweak math symbols in the write-up

* final blog polish

* final blog polish

* final blog polishes

* final blog polishes - word tweaks

* final blog polishes - word tweaks

* final blog polishes - word tweaks

* final blog polishes - stratified physics description tweak

* add paths to released resources to blog

Author: payelmuk150