Briefly document Travis-based workflow

.assets/Makefile

@@ -0,0 +1,7 @@
+.PHONY: all
+
+all: ooni.io.png
+
+%.png: %.seqdiag
+	# Use any TTF font, otherwise text is UGLY.
+	seqdiag --antialias --no-transparency --font /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf $^ -o $@

.assets/ooni.io.seqdiag

@@ -0,0 +1,14 @@
+{
+Editor --> "GH:ooni-web" [label = "Open PR"];
+Editor --> Reviewers [label = "Request for comments"];
+Editor <-- Reviewers [label = "Got ACK"];
+Editor --> "GH:ooni-web" [label = "[Merge] PR to `master`"];
+
+"GH:ooni-web" --> "Travis" [label = "Trigger build"];
+Travis --> "openobservatory\n.github.io" [label = "Upload built website"];
+Travis --> "Editor" [label = "Email build status"];
+
+Editor --> "openobservatory\n.github.io" [label = "Preview at\nopenobservatory.github.io"];
+Editor --> "ooni\n.torproject.org" [label = "Run `make update-site` to\nupdate ooni.torproject.org"];
+"ooni\n.torproject.org" --> "openobservatory\n.github.io" [label = "Fetch from GH"];
+}

Readme.md

@@ -63,8 +63,8 @@ make publish-update
 
 ## Adding a new blog post
 
-When adding a new blog post and make it appear on the front page you shall edit
-`themes/ooni/layouts/index.html`.
+![ooni-web workflow](.assets/ooni.io.png)
+
 
 ## Python requirements