Recommended browser documentation (#251)

* Documentation page for unsupported browsers

* Update unsupported documentation with mac info

* Blur irrelevant information in version screenshots

* Rename to Peli's suggested path

* Browser recommendation for each platform

docs/browsers/linux.md

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+# Unsupported configuration
+
+As you are using Linux, it is recommended that you use Mozilla Firefox or Google
+Chrome.
+
+Please see [here](/browsers) for more information.

docs/browsers/mac.md

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+# Unsupported configuration
+
+As you are using OS X, it is recommended that you use Safari. Alternatively,
+Google Chrome and Mozilla Firefox are also supported.
+
+Please see [here](/browsers) for more information.

docs/browsers/windows.md

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+# Unsupported configuration
+
+As you are using Windows, it is recommended that you use Microsoft Edge. If you
+are running a version of Windows prior to Windows 10, you can use Internet
+Explorer 11. Alternatively, Google Chrome and Mozilla Firefox are also
+supported.
+
+Please see [here](/browsers) for more information.