update docs README

Author: Michael Lin

docs/README.md

@@ -1,5 +1,11 @@
 To update the documentation
 
-1. Install packages: `pip install -r requirements.txt`
-2. Modify source files in `source/`
-3. Compile the code: `make html`
+1. Install connectomics package
+2. Install docs package: `pip install -r requirements.txt`
+3. Install correct version of pytorch_sphinx_theme: 
+```
+    git clone https://github.com/pytorch/pytorch_sphinx_theme
+    pip install -e pytorch_sphinx_theme
+```
+4. Modify source files in `source/`
+5. Compile the code: `make html`