remove submodules

[matrix_esp_thesis] / ext / olm

diff --git a/ext/olm b/ext/olm
deleted file mode 160000 (submodule)
index 66294cf..0000000
--- a/ext/olm
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 66294cf7f66ae380683dbb7f43a16a8922249fc8