Add links to tutorial source to book

This adds to both tutorials' sources to the book, so that people can
find the finished project more easily.

Author: DirectXMan12

docs/book/src/cronjob-tutorial/cronjob-tutorial.md

@@ -19,6 +19,23 @@ once, seeing them to completion.
 Instead of trying to tackle rewriting the Job controller as well, we'll
 use this as an opportunity to see how to interact with external types.
 
+<aside class="note">
+
+<h1>Following Along vs Jumping Ahead</h1>
+
+Note that most of this tutorial is generated from literate Go files that
+live in the book source directory:
+[docs/book/src/cronjob-tutorial/testdata][tutorial-source].  The full,
+runnable project lives in [project][tutorial-project-source], while
+intermediate files live directly under the [testdata][tutorial-source]
+directory.
+
+[tutorial-source]: https://github.com/kubernetes-sigs/kubebuilder/tree/master/docs/book/src/cronjob-tutorial/testdata
+
+[tutorial-project-source]: https://github.com/kubernetes-sigs/kubebuilder/tree/master/docs/book/src/cronjob-tutorial/testdata/project
+
+</aside>
+
 ## Scaffolding Out Our Project
 
 As covered in the [quick start](../quick-start.md), we'll need to scaffold

docs/book/src/multiversion-tutorial/tutorial.md

@@ -11,7 +11,21 @@ different versions are supported by our CronJob project.
 If you haven't already, make sure you've gone through the base [CronJob
 Tutorial](/cronjob-tutorial/cronjob-tutorial.md).
 
-## Aside: Kubernetes Versions
+<aside class="note">
+
+<h1>Following Along vs Jumping Ahead</h1>
+
+Note that most of this tutorial is generated from literate Go files that
+form a runnable project, and live in the book source directory:
+[docs/book/src/multiversion-tutorial/testdata/project][tutorial-source].
+
+[tutorial-source]: https://github.com/kubernetes-sigs/kubebuilder/tree/master/docs/book/src/multiversion-tutorial/testdata/project
+
+</aside>
+
+<aside class="note warning">
+
+<h1>Minimum Kubernetes Versions Incoming!</h1>
 
 CRD conversion support was introduced as an alpha feature in Kubernetes
 1.13 (which means it's not on by default, and needs to be enabled via
@@ -23,6 +37,8 @@ If you're on Kubernetes 1.12 or below, you'll need a new cluster to use
 conversion. Check out the [KinD instructions](/reference/kind.md) for
 instructions on how to set up a all-in-one cluster.
 
+</aside>
+
 Next, let's figure out what changes we want to make...
 
 [kube-feature-gates]: https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/ "Kubernetes Feature Gates"

docs/book/theme/css/general.css

@@ -402,6 +402,7 @@ main > details.collapse-code > summary::after {
 aside.note {
     border: 1px solid var(--searchbar-border-color);
     border-radius: 3px;
+    margin-top: 1em;
 }
 
 aside.note > * {
@@ -416,6 +417,7 @@ aside.note > h1 {
     padding: 0.5em 1em;
     font-size: 100%;
     font-weight: normal;
+    background: var(--quote-bg);
 }
 
 /* warning notes */