Updated rsync mirror commands

Changed delete-after to delete-during to save disk space during the mirror
operation

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Updated overlays

- Lowercased all overlay names
- Added production and staging overlays for applications

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Added mirror cron job for overlay distfiles

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Updated local distfile location in overlay mirror cronjob

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Added docs regarding a potential build pipeline

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Added mem alloc recommendations for vms

Signed-off-by: Byron Sanchez <byron@hackbytes.com>
Updated organization of local distfiles

- Added environments to staging and production nodes for determining which
  overlay to use when installing applications
- Added localnet overlay distfile directories to be web accessible
- Updated gentoo mirror list with a localnet mirror for main portage tree
  packages
- Added application overlays to gentoo mirrors list depending on whether the node
  is a production or staging node

Signed-off-by: Byron Sanchez <byron@hackbytes.com>