Include the api docs

Maybe a bit weird doing this as part of the emscripten job...

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index 1500bc5..106daf1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,10 @@
   include:

     - name: "Emscripten"

       env: CACHE_NAME=emscripten2

+      addons:

+        apt:

+          doxygen

+          graphviz

       cache:

         directories:

           - $HOME/.emscripten_ports

@@ -31,6 +35,8 @@
         - docker exec -it emscripten emcmake cmake -B build.em -G "Unix Makefiles"

         - docker exec -it emscripten make -C build.em

       before_deploy:

+        - cd 32blit && doxygen doxygen.conf && cd ..

+        - cp -r 32blit/documentation/html/* site

         - cp build.em/examples/*/*.{js,wasm} site/examples

       deploy:

         provider: pages:git