Hugoizing doc site

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

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+---
+title: Syntax
+weight: 0
+---
+
+## About `.Env`
+
+You can easily access environment variables with `.Env`, but there's a catch:
+if you try to reference an environment variable that doesn't exist, parsing
+will fail and `gomplate` will exit with an error condition.
+
+Sometimes, this behaviour is desired; if the output is unusable without certain
+strings, this is a sure way to know that variables are missing!
+
+If you want different behaviour, try [`getenv`](../functions/#getenv).