OhMyForm should not be used [skip ci]

pica-oh-my-form/README.md → old/pica-oh-my-form/README.md

 ## PicaForm
 
+**This projet is considered broken and should not be used**.
+
+Initially, a TX tried to create a service based on TellForm. The later has been deprecated and superseded by OhMyForm.
+
+However, OhMyForm still has a lot of problems which are not Picasoft-compatibles, examples are :
+* Calls to externals third party domains, i.e. heap.io, Google Analytics, etc.
+* Production mode not working (only development mode)
+* Lots, lots of scripts loaded (SPA-style)
+* Some features broken
+
+This service may be usable once the refactor is done (expected for v1.0), but for now we refuse to use it. 
+
 ### Introduction
 
 This is a custom Dockerfile and Docker Compose of [OhMyForms](https://github.com/ohmyform/ohmyform/), made for the Picasoft infrastructure (Traefik in mind).