Added other altair features to docs.

docs/_data/features.yml

@@ -5,7 +5,7 @@
     that is preserved across browser sessions. In addition, you can give each window
     a custom name.
 -
-  title: Syntax Highlighting
+  title: Syntax and Error Highlighting
   content: >
     With syntax highlighting, you have immediate feedback on what you input in the
     query editor and can easily detect errors. The editor also affords folding of
@@ -31,4 +31,48 @@
   content: >
     Altair provides convenient support for setting GraphQL variables. You can also add
     fragments in the code editor and reference them within the parent query. Fragments can
-    also be added from the docs bar.
+    also be added from the docs bar.
+-
+  title: Add Queries and Fragments
+  content: >
+    You can easily add a query (or fragment) you see in the documentation into the editor
+    without having to manually type every field within the query. This makes it easier to
+    test and develop with the available queries from the GraphQL server.
+-
+  title: Prettify Query
+  content: >
+    You can format the query in the editor in a properly indented manner for easier reading.
+    This makes it easy to work with queries you might copy from one file to another,
+    which might have lost their indentation (or were never indented before).
+-
+  title: Compress Query
+  content: >
+    You can compress the query to a minified form, removing any unnecessary whitespace
+    and comments. You can use this after you have made a query and you want to use it in your
+    client side application. This helps save as many bytes as possible when making network requests.
+-
+  title: History of recent queries
+  content: >
+    You can view a list of your most recent queries that you make in each window, so you can easily go
+    back to a query you tried previously.
+-
+  title: GraphQL Subscriptions (with desktop notifications)
+  content: >
+    You can test your GraphQL subscriptions easily and also get a notification when you are away from the
+    app (desktop apps only). This is very handy when developing apps that use the realtime feature of
+    GraphQL, like chatting ang gaming applications that need realtime feedback.
+-
+  title: Import and Export Queries
+  content: >
+    You can export the query you are working on and import the .agq file into another device
+    (also supports drag and drop). This is also useful for sharing queries with variables and headers
+    with other members of your team.
+-
+  title: Multiple Languages
+  content: >
+    You can use Altair comfortably in your native language with several languages
+    (including English, Chinese, French, Spanish, among others) supported.
+-
+  title: Multiple themes
+  content: >
+    You can use Altair with either the light or the dark theme, depending on which theme you like.