Add live reloading (#1786)

Replace the existing webserver target with a live-reloading target.

Adds a dependency on https://github.com/executablebooks/sphinx-autobuild

Dockerfile

@@ -15,4 +15,4 @@ RUN pip3 install --no-cache-dir --no-binary :all: -r requirements.txt
 EXPOSE 8000
 WORKDIR /data/esphomedocs
 
-CMD ["make", "webserver"]
+CMD ["make", "live-html"]

Makefile

@@ -1,10 +1,12 @@
 ESPHOME_PATH = ../esphome
 ESPHOME_REF = 2022.1.2
 
-.PHONY: html html-strict cleanhtml deploy help webserver Makefile netlify netlify-api api netlify-dependencies svg2png copy-svg2png minify
+.PHONY: html html-strict cleanhtml deploy help live-html Makefile netlify netlify-api api netlify-dependencies svg2png copy-svg2png minify
 
 html:
 	sphinx-build -M html . _build -j auto -n $(O)
+live-html:
+	sphinx-autobuild . _build -j auto -n $(O) --host 0.0.0.0
 
 html-strict:
 	sphinx-build -M html . _build -W -j auto -n $(O)
@@ -48,9 +50,6 @@ copy-svg2png:
 
 netlify: netlify-dependencies netlify-api html copy-svg2png
 
-webserver: html
-	cd "_build/html" && python3 -m http.server
-
 lint: html-strict
 	python3 travis.py
 

guides/contributing.rst

@@ -110,15 +110,12 @@ To check your documentation changes locally, you first need install Sphinx (with
     # in ESPHome-Docs repo:
     pip install -r requirements.txt
 
-Then, use the provided Makefile to build the changes and start a simple web server:
+Then, use the provided Makefile to build the changes and start a live-updating web server:
 
 .. code-block:: bash
 
     # Start web server on port 8000
-    make webserver
-
-    # Updates then happen via:
-    make html
+    make live-html
 
 Notes
 *****

requirements.txt

@@ -1 +1,2 @@
 sphinx==4.3.2
+sphinx-autobuild==2021.3.14