Update to current mkdocs and mkdocs-material theme

mkdocs (0.17.3)
mkdocs-material (2.7.1)

mkdocs.template.yml

@@ -1,11 +1,12 @@
 ---
-theme: material
-theme_dir: theme
+theme:
+    name: material
+    custom_dir: theme
+    font:
+      text: 'Open Sans:300,400,400i,600,700'
 docs_dir: projects
 site_dir: 'html'
 extra:
-  font:
-    text: 'Open Sans:300,400,400i,600,700'
   menu:
     - text: 'Products'
       link: 'https://www.icinga.com/products/'
@@ -35,7 +36,6 @@ extra:
       link: 'https://www.icinga.com/feed/'
 extra_css:
 - css/theme.css
-extra_javascript: []
 markdown_extensions:
   - smarty
   - admonition

theme/css/theme.css

@@ -319,6 +319,10 @@
     top: 1rem;
 }
 
+.md-search__form {
+    width: 40rem;
+}
+
 #mkdocs-search-results {
     font-family: "Open Sans"
 }