[docs] Make the link to initial setup stand out. (#533)

* [docs] Make the link to initial setup stand out.
* [docs] Merge the two quick starts
* More descriptive text about the setup link
Co-authored-by: alonamid <alonamid@eecs.berkeley.edu>

docs/conf.py

@@ -106,6 +106,9 @@ html_theme_options = {
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
+html_css_files = [
+        'css/custom.css',
+]
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.