Update 'Building rootfs tarballs'

Building-rootfs-tarballs.md

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+Rootfs tarballs allow us to quickly deploy systems, as opposed to building source code locally through the ELIF.
+
+**Step 1 - Prepare the environment**
+
+Building an Everest rootfs tarball requires a proper environment to be set up.
+
+To take the easy way out, download and run `setup-env.sh`
+
+To do everything manually, do the following:
+
+1 - Create a workspace directory (preferrably /mnt/everest)
+
+2 - Create a build user (preferrably named 'everest')
+
+3 - Create an environment variable for ease of use
+
+	`$ export EVEREST=/mnt/everest # replace /mnt/everest with the path to your workspace`
+
+4 - Change permissions of the workspace
+
+	`# chmod 777 ${EVEREST}