docs: fix too small text in tables

docs/borg_theme/css/borg.css

@@ -69,6 +69,18 @@ dt code {
     white-space: normal;
 }
 
+/* for some reason the rtd theme makes text in tables very small.
+ * fix that.
+ */
+.wy-table td,
+.rst-content table.docutils td,
+.rst-content table.field-list td,
+.wy-table th,
+.rst-content table.docutils th,
+.rst-content table.field-list th {
+    font-size: 100%;
+}
+
 code,
 .rst-content tt.literal,
 .rst-content tt.literal,