Add impress-extras repo as submodule, under extras/

This also adds a new extra addon: MathJax.js. The following commit will use it in an example presentation.
henrikingo · May 1, 2017 · 9595627 · 9595627
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commit 9595627
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diff --git a/.gitmodules b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "extras"]
+	path = extras
+	url = https://github.com/henrikingo/impress-extras.git
diff --git a/extras b/extras