Add markdown to html

Gemfile.lock

@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    commonmarker (2.10.1-x86_64-linux)
     date (3.6.0)
     dotenv (3.2.0)
     erb (6.0.7)
@@ -56,10 +57,10 @@ GEM
     tsort (0.2.0)
 
 PLATFORMS
-  ruby
   x86_64-linux
 
 DEPENDENCIES
+  commonmarker
   dotenv
   erubi
   irb
@@ -70,6 +71,7 @@ DEPENDENCIES
   tilt
 
 CHECKSUMS
+  commonmarker (2.10.1-x86_64-linux) sha256=4b2c4b9084baca131146c92dde02bcb40ef3d2768a6772648c1970bb51842734
   date (3.6.0) sha256=18ac945c4e24ebd93534f8eab8c2fd8c5604b3e977105b3798d62a1e8d27b580
   dotenv (3.2.0) sha256=e375b83121ea7ca4ce20f214740076129ab8514cd81378161f11c03853fe619d
   erb (6.0.7) sha256=c5ca6dc25b0ef974a44dc8f59fe847577122483b1968a38dec305c60bf91ee92