Move pages back into a "pages" folder

pages/linux/apt-get.md

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+# apt-get
+
+> Debian and Ubuntu package management utility
+
+- Synchronize list of packages and versions available. This should be run first, before running subsequent apt-get commands.
+ 
+`apt-get update`
+
+- install a new package
+
+`apt-get install {{package}}`
+
+
+- remove a package
+ 
+`apt-get remove {{package}}`
+
+- Upgrade installed packages to newest available versions
+
+`apt-get upgrade`
+
+- Upgrade installed packages (like `apt-get upgrade`) including removing obsolete packages and installing additional packages to meet new package dependencies. 
+
+`apt-get dist-upgrade`