Update instructions images

instructions/docs/part_0_A.md

@@ -1,5 +1,13 @@
 ## Part 0 (A): Preparation: get RottenPotatoes running locally
 
+
+ The actual RottenPotatoes starter app you will use is in another public repo: [saasbook/rottenpotatoes-rails-intro](https://github.com/saasbook/rottenpotatoes-rails-intro). Fork that repo to your own GitHub account, and then
+ clone your fork:
+
+ ```sh
+ $ git clone git@github.com:[your_github_username]/rottenpotatoes-rails-intro.git
+ ```
+
 Whenever you start working on a Rails project, the first thing you should do is to run Bundler, to make sure all the app's gems are installed.  Switch to the app's root directory (presumably `rottenpotatoes-rails-intro`) and run `bundle install --without production` (you only need to specify `--without production` the first time, as this setting will be remembered on future runs of Bundler for this project).
 
 Finally, get the local database created:

instructions/docs/part_1.md

@@ -6,7 +6,7 @@ When the listing page is redisplayed with sorting-on-a-column enabled, the colum
 
 The result should look something like this:
 
-![](https://github.com/saasbook/hw-rails-intro/blob/master/table-header-screenshot.png)
+![Screeing showing the "Movie Title" column selected with a yellow background.](../table-header-screenshot.png)
 
 **IMPORTANT for grading purposes:**
 

instructions/docs/part_2.md

@@ -2,7 +2,7 @@
 
 Enhance RottenPotatoes as follows. At the top of the All Movies listing, add some checkboxes that allow the user to filter the list to show only movies with certain MPAA ratings:
 
-![](https://github.com/saasbook/hw-rails-intro/blob/master/filter-screenshot.png)
+![Screenshot. The filter should be included somewhere below the page heading. It should have a checkbox for each rating, followed by a "Refresh" button.](../filter-screenshot.png)
 
 When the Refresh button is pressed, the list of movies is redisplayed showing only those movies whose ratings were checked.