Add first tip

content/tips/iex-dbg-pry.md

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+I love `iex -S mix ...` but I usually don't like when `dbg` asks me to `pry`.
+Just show me my data! Well, today I learned about `iex --no-pry`:
+
+```bash
+$ iex --help
+Usage: iex [options] [.exs file] [data]
+... (snip)
+  --no-pry            Doesn't start pry sessions when dbg/2 is called.
+```
+
+Now I can `iex --no-pry -S mix ...` and just see output instead of dealing with
+the prompts for `pry`ing! Not sure if anybody else felt this pain, but there
+ya go.