Remove https://cloud.blender.org from URLs

URLs should be host-relative, so that they also work on devservers.
URLs in emails should remain absolute, though; we may want to change those
to use {{ url_for(..., _external=True) }} at some point.

src/templates/services.pug

@@ -55,7 +55,7 @@ meta(name="twitter:image", content="{{ url_for('static', filename='assets/img/ba
 					small Blender Cloud add-on requires Blender 2.78 or newer
 
 				a.page-card-cta.download(
-					href="https://cloud.blender.org/r/downloads/blender_cloud-latest-addon.zip")
+					href="/r/downloads/blender_cloud-latest-addon.zip")
 					i.pi-download
 					| Download add-on &nbsp;<small>v</small> {{ config.BLENDER_CLOUD_ADDON_VERSION }}
 
@@ -78,7 +78,7 @@ meta(name="twitter:image", content="{{ url_for('static', filename='assets/img/ba
 
 
 				a.page-card-cta(
-					href="https://cloud.blender.org/blog/introducing-blender-sync")
+					href="/blog/introducing-blender-sync")
 					| Learn More
 
 			.page-card-side
@@ -91,7 +91,7 @@ meta(name="twitter:image", content="{{ url_for('static', filename='assets/img/ba
 				h2.page-card-title Texture & HDRI Browser
 				.page-card-summary
 					p.
-						Access the <a href="https://cloud.blender.org/p/textures/">Blender Cloud Textures</a>
+						Access the <a href="/p/textures/">Blender Cloud Textures</a>
 						library from within Blender using our exclusive add-on.
 						Create, manage and share <em>your own</em> texture libraries!
 
@@ -124,7 +124,7 @@ meta(name="twitter:image", content="{{ url_for('static', filename='assets/img/ba
 					| Watch Video
 
 				a.page-card-cta.outline(
-				href="https://cloud.blender.org/blog/introducing-image-sharing")
+				href="/blog/introducing-image-sharing")
 					| Learn More
 
 			.page-card-side
@@ -140,7 +140,7 @@ meta(name="twitter:image", content="{{ url_for('static', filename='assets/img/ba
 					Upload assets and collaborate with other Blender Cloud members.
 
 				a.page-card-cta(
-					href="https://cloud.blender.org/blog/introducing-private-projects")
+					href="/blog/introducing-private-projects")
 					| Learn More
 
 			.page-card-side
@@ -162,7 +162,7 @@ meta(name="twitter:image", content="{{ url_for('static', filename='assets/img/ba
 					| Watch Video
 
 				a.page-card-cta(
-					href="https://cloud.blender.org/blog/attract-and-flamenco-public-beta",
+					href="/blog/attract-and-flamenco-public-beta",
 					title="Learn more about Attract")
 					| Learn More