remove codelab.pdf file, add redirect; move graffle files to be under src/diagrams

src/tutorials/diagrams/remove-elements/remove-element.graffle

Index: src/tutorials/diagrams/remove-elements/remove-element.graffle
diff --git a/src/tutorials/diagrams/remove-elements/remove-element.graffle b/src/tutorials/diagrams/remove-elements/remove-element.graffle
deleted file mode 100644
index 0645a79d006f983afc14c4155c1fe2f9fb4cb3f4..0000000000000000000000000000000000000000
--- a/src/tutorials/diagrams/remove-elements/remove-element.graffle
+++ /dev/null
@@ -1,1948 +0,0 @@
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-		<integer>0</integer>
-		<key>ExpandedCanvases</key>
-		<array>
-			<dict>
-				<key>name</key>
-				<string>Canvas 1</string>
-			</dict>
-		</array>
-		<key>Frame</key>
-		<string>{{240, 291}, {1080, 862}}</string>
-		<key>ListView</key>
-		<true/>
-		<key>OutlineWidth</key>
-		<integer>142</integer>
-		<key>RightSidebar</key>
-		<true/>
-		<key>ShowRuler</key>
-		<true/>
-		<key>Sidebar</key>
-		<false/>
-		<key>SidebarWidth</key>
-		<integer>120</integer>
-		<key>VisibleRegion</key>
-		<string>{{-166, 0}, {909, 723}}</string>
-		<key>Zoom</key>
-		<real>1</real>
-		<key>ZoomValues</key>
-		<array>
-			<array>
-				<string>Canvas 1</string>
-				<real>1</real>
-				<real>2</real>
-			</array>
-		</array>
-	</dict>
-</dict>
-</plist>