Move deprecated demos into deprecated subdirectory (#320)

Creates a `deprecated` subdirectory with a simple README and
moves the deprecated envoy, epiphany, openlitespeed, and unbound
demo directories into the new subdirectory.

Fixes #312

Signed-off-by: Alex Bozarth <[email protected]>

README.md

@@ -13,7 +13,7 @@ In most cases, Dockerfiles encode the instructions for ease-of-use: Just do `doc
 
 As the level of interest in providing and maintaining these integrations for public consumption has fallen, the packages are tagged with the github monikers of the persons willing to keep supporting them or the term "Unmaintained". If that tag is listed, no CI and github support for the integration is available and the code shall be seen as a snapshot that once worked only. 
 
-We are explicitly soliciting contributors to maintain those integrations labelled "unsupported".
+We are explicitly soliciting contributors to maintain those integrations labelled "Unmaintained".
 
 Currently available integrations at their respective support level:
 

deprecated/README.md

@@ -0,0 +1,11 @@
+# Deprecated demos
+
+> [!Warning]
+> Demos in this directory are longer supported, if you're interested in revitalizing a demo please submit a PR. 
+
+Demos are considered deprecated when two factors are met, and can be un-deprecated by anyone willing to address them:
+
+1. **Out of date or broken**: Either the demo is still based on the old oqs openssl1.1.1 fork rather than openssl3 using the oqs provider or it is not in a working state.
+2. **No interest or expertise**: The community has shown no interest in updating or maintaining the demo
+
+> **Note**: Demos that only meet factor 2 are considered Unmaintained, not Deprecated.