fix file name typo

.drone.yml

@@ -14,7 +14,7 @@ steps:
   - name: inject
     commands:
       - echo "<link rel="stylesheet" href="/css/themes/dark-theme.css" />" > /home/gogs/gogs/custom/templates/inject/head.tmpl
-      - echo "<link rel="stylesheet" href="/css/themes/simplemde-darker.css" />" >> /home/gogs/gogs/custom/templates/inject/head.tmpl
+      - echo "<link rel="stylesheet" href="/css/themes/simplemde-dark.css" />" >> /home/gogs/gogs/custom/templates/inject/head.tmpl
 
       - echo "<link rel="stylesheet" href="/css/themes/codemirror-material.css" />" >> /home/gogs/gogs/custom/templates/inject/head.tmpl
 

README.md

@@ -11,7 +11,7 @@ An improved gogs dark theme, original from [Stylish](https://userstyles.org/styl
 
 ```html
     <link rel="stylesheet" href="/css/themes/dark-theme.css" />
-    <link rel="stylesheet" href="/css/themes/simplemde-darker.css" />
+    <link rel="stylesheet" href="/css/themes/simplemde-dark.css" />
     <link rel="stylesheet" href="/css/themes/codemirror-material.css" />
 ```