Move pages back into a "pages" folder

pages/osx/brew.md

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+# brew
+
+> Package manager for OS X
+
+- Search formula
+
+`brew search {{text}}`
+
+- Install formula
+
+`brew install {{formula}}`
+
+- List installed formulae [with matching name]
+
+`brew list {{[text]}}`
+
+- Get latest version of installed formula (passing no formula updates all installed formulae)
+
+`brew upgrade {{[formula]}}`
+
+- Update brew
+
+`brew update`
+
+- Switch version of formula
+
+`brew switch {{formula}} {{version}}`