autobuild.sh: include webpage.py execution (greenelab#113)

Most autobuild users will want to automatically update the webpage. See discussion at
manubot/rootstock#101 (comment)

Update README to better document autobuild.

README.md

@@ -46,13 +46,9 @@ Then, you can build the manuscript on POSIX systems by running the following com
 # Activate the manubot conda environment (assumes conda version >= 4.4)
 conda activate manubot
 
-# Build the manuscript
+# Build the manuscript, saving outputs to the output directory
 sh build/build.sh
 
-# Or monitor the content directory, and automatically rebuild the manuscript
-# when a change is detected.
-sh build/autobuild.sh
-
 # At this point, the HTML & PDF outputs will have been created. The remaining
 # commands are for serving the webpage to view the HTML manuscript locally.
 
@@ -64,6 +60,13 @@ cd webpage
 python -m http.server
 ```
 
+Sometimes it's helpful to monitor the content directory and automatically rebuild the manuscript when a change is detected.
+The following command, while running, will trigger both the `build.sh` and `webpage.py` scripts upon content changes:
+
+```sh
+sh build/autobuild.sh
+```
+
 ### Continuous Integration
 
 [![Build Status](https://travis-ci.org/greenelab/manubot-rootstock.svg?branch=master)](https://travis-ci.org/greenelab/manubot-rootstock)

build/autobuild.sh

@@ -1,6 +1,6 @@
-# Automatically rebuild manuscript when content changes
+# Automatically rebuild mansucript outputs and the webpage when content changes
 # Depends on watchdog https://github.com/gorakhargosh/watchdog
 watchmedo shell-command \
   --wait \
-  --command='sh build/build.sh' \
+  --command='sh build/build.sh && python build/webpage.py' \
   content