Client readme updates.

client/README.md

@@ -26,7 +26,7 @@ There are many moving parts to the client build system, but the entrypoint for
 most people is the 'client' rule in the Makefile at the root of the Galaxy
 repository.  Execute the following to perform a complete build suitable for
 local development, including dependency staging, style building, script
-processing and bundling.  This is a development-specific build which includes
+processing, and bundling.  This is a development-specific build which includes
 extra debugging features, and excludes several production optimizations made
 during the build process.
 
@@ -57,19 +57,21 @@ This will first stage any dependencies (yarn-installed packages like jquery,
 etc), and then will watch for changes in any of the galaxy client source files.
 When a file is changed, the client will automatically rebuild, after which you
 can usually force refresh your browser to see changes.  Note that it is still
-recommended to run 'make client' after you are finished actively developing
-using 'make client-watch'.
+recommended to run `make client` after you are finished actively developing
+using `make client-watch`.
 
 
 Changing Styles/CSS
 ===================
 
-The CSS and styling used by Galaxy is also controlled from this directory.
-Galaxy uses Sass for its styling, a superset of CSS that compiles to CSS. Sass
-files are kept in client/galaxy/style/scss. Compiled CSS is in
-static/style/blue.
+Galaxy uses Sass for its styling, which is a a superset of CSS that compiles
+down to regular CSS.  Most Galaxy styling source (.scss) files are kept in
+`client/galaxy/style/scss.  There are additionally style blocks alongside some
+Vue components -- styles that are particular to that individual component and
+do not apply site-wide.
 
-As mentioned above, 'make client' will also rebuild styles.  If you *only* want
-to run the style task, use the following command from the `client` directory:
+On build, the compiled css bundle is served at `/static/style/base.css`.
 
-    yarn run style
+As mentioned above, `make client` will rebuild styles, as a part of the webpack
+build.  For iterative development, "Watch Mode" rebuilds as described above do
+include style changes.