[etherpad-web/oscp-backend] Bump to 1.8.5 and drop markdown plugin

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit bc8b142804307e24100026ed3fe5290e7712417b
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Fri Dec 18 10:27:51 2020 +0100

    Bump to 1.8.5 and drop markdown plugin

 Dockerfile | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/Dockerfile b/Dockerfile
index c5f4172..c4b82be 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM node:10-buster-slim
 
-ENV ETHERPAD_VERSION 1.8.4
+ENV ETHERPAD_VERSION 1.8.5
 ENV NODE_ENV production
 
 RUN apt-get update && \
@@ -29,8 +29,7 @@ RUN npm install ep_adminpads \
     ep_align \
     ep_spellcheck \
     ep_headings2 \
-    ep_font_color \
-    ep_markdown
+    ep_font_color
 
 USER etherpad
 EXPOSE 9001