Docs.

- Add IOS screenshots.
- Add drop-shadows to screenshots that need them.
- Optimise PNGs for size.

doc-src/certinstall/ios.html

@@ -0,0 +1,16 @@
+
+### 1: Set up the Mail app on the device to receive email.
+
+### 2: Mail the mitmproxy-ca-cert.pem file to the device, and tap on the attachment.
+
+### 3: You will be prompted to install a profile. Click "Install":
+
+<img src="@!urlTo('ios-profile.png')!@"/>
+
+### 4: Accept the warning by clicking "Install" again:
+
+<img src="@!urlTo('ios-warning.png')!@"/>
+
+### 5: The certificate should now be trusted:
+
+<img src="@!urlTo('ios-installed.png')!@"/>

doc-src/certinstall/osx.html

@@ -1,5 +1,5 @@
 
-### 1: Open Finder, and double-click on the mitmproxy ca.pem file.
+### 1: Open Finder, and double-click on the mitmproxy-ca-cert.pem file.
 
 
 ### 2: You will be prompted to add the certificate. Click "Always Trust": 

doc-src/certinstall/windows7.html

@@ -1,6 +1,4 @@
 
-These instructions were tested on Windows 7. 
-
 ### 1: Copy the ~/.mitmproxy/mitmproxy-ca-cert.p12 file to the target system.
 
 ### 2: Double-click the certificate file. You should see a certificate import wizard: