Email: tweaks to welcome message layout and content

According to the discussion after commit c2518e9ae1.

src/templates/emails/welcome.txt

@@ -1,53 +1,66 @@
 {% extends "emails/layout.txt" %}
 {% set blender_cloud = abs_url('cloud.homepage') %}
-{% block body %}Welcome to Blender Cloud, {{ user.full_name or user.nickname }}!
+{% block body %}
 
-Sybren here. I'm one of the Blender Cloud developers, and I'm very
-happy to welcome you. The Blender Animation Studio projects are
-made possible thanks to you! In this email I'll explain where to
-go and what to see. If you want to dive in now, just log in and
-explore at:
+Welcome to Blender Cloud, {{ user.full_name or user.nickname }}!
+
+Thanks for joining Blender Cloud, the Open Content creation
+platform. Your subscription helps our team to create more Open
+Projects, training, services and of course to make Blender the
+best CG pipeline in the world. You rock!
 
     {{ blender_cloud }}
 
-To get the most out of Blender Cloud, be sure to check out the
-services we offer at, like accessing our texture library from
-within Blender using the Cloud add-on, Blender Sync, and Image
-Sharing:
+Here is a quick guide to help you get started with Blender Cloud.
+
+
+## Discover the Training Content
+
+Our high quality training is organised in courses, where
+experienced trainers teach you step-by-step specific techniques,
+and workshops, where you get the feeling of peeking behind the
+shoulders of an artist explaining their creative workflow.
+
+    {{ abs_url('cloud.courses') }}
+    {{ abs_url('cloud.workshops') }}
+
+
+## Try our Services
+
+Make sure you download the Blender Cloud Add-on, so you can
+synchronize your Blender settings across multiple computers with
+Blender Sync, access our Texture and HDRI libraries directly
+within Blender, and much more.
+
     {{ abs_url('cloud.services') }}
+    https://cloud.blender.org/blog/introducing-blender-sync
 
 
-If you have any questions, remarks, ideas, or complaints, you can
-contact us at cloudsupport@blender.org. We're always happy to
-help, and on working days we'll get back to you within a day.
+## Follow the Open Projects
 
-To update your personal details, such as your email address,
-password, or full name, please visit Blender ID at:
-    https://www.blender.org/id/
+Follow Hero and Spring, access exclusive making-of content and
+assets from our current and past Open Projects.
 
-For renewing your subscription and other monetary things, there is
-the Subscription Overview at the Blender Store:
-    https://store.blender.org/my-account/subscriptions/
+    https://cloud.blender.org/p/hero/
+    https://cloud.blender.org/p/spring/
+    {{ abs_url('cloud.open_projects') }}
 
-Warm regards,
 
-Sybren A. Stüvel
-and the entire Blender Cloud team
+## We are here for you
+
+Do you have any question about your subscription? Any suggestion
+on how to improve Blender Cloud? Just reply to this message or
+write us at
+
+    cloudsupport@blender.org
+
+on working days we'll get back to you within a day.
+
+
+Cheers,
+Sybren and the Blender Cloud Team
 
 PS: If you do not want to receive other emails from us, we've got
-you covered: {{ abs_url('settings.emails') }}
+you covered. {{ abs_url('settings.emails') }}
 
-
-
-About Blender Cloud
-
-Blender Cloud is the creative hub for your projects, powered by
-Free and Open Source software.
-
-On Blender Cloud you can create and share personal projects,
-access our texture and HDRI library, keep track of your
-production, manage your renders, and much more!
-
-The Blender Animation Studio projects are made possible thanks to
-subscriptions to the Blender Cloud. Thanks for joining!
 {% endblock %}