Fix up styling of tables in documentation

docs/extra.css

@@ -0,0 +1,12 @@
+/* Custom table styling */
+table {
+    margin-bottom: 24px;
+    width: 100%;
+}
+th {
+    background-color: #f0f0f0;
+    padding: 6px;
+}
+td {
+    padding: 6px;
+}

mkdocs.yml

@@ -7,11 +7,12 @@ python:
 theme:
     name: readthedocs
     navigation_depth: 3
+extra_css:
+    - extra.css
 markdown_extensions:
     - admonition:
     - markdown_include.include:
         headingOffset: 1
-
 nav:
     - Introduction: 'index.md'
     - Installation: