feat: update sampling and folding stability files

Sampling now contains the same structures as folding stability. The
folder structure of folding stability has also been updated to match
that of sampling in order to stress the fact that they are the same
files. The structures contained are now:
- Chignolin 1uao
- Amyloid Beta 1ba6
- Trp cage 2jof

folding_stability.zip

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:3f94e114430d3a6869de55574e037445d9674fe913892468609b1a65d2f5a659
-size 415859
+oid sha256:c64a172e9db20c83017ef09280cb9f5136451a33693d7050a1900acfffe9658b
+size 419880

sampling.zip

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:c881e0e93f0c398d8af950d097080314f90550fa0fb824fd2e0c4ba885d6877a
-size 288215
+oid sha256:c075cb72c662c527ea148a29b976d15ac328f2e789edfcd3e8e6d7f51c59ec37
+size 603420