Add migration documentation

docs/migration/v1.1.x to v1.2.x.md

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+## v1.1.x to v1.2.x
+
+With v1.2 we made it possible to run multiple jails of the same type.
+This is done by seperating jails (your individual installs) from blueprints (our designs).
+
+Due to this change, the config file has been changed and thus you need to adapt your config file.
+
+
+### Jails
+
+All your jails need to be indented by 2 spaces under a main group "jails" like this:
+
+`
+jail:
+  plex: 
+    blueprint: plex
+    ip4_addr: 192.168.1.99/24
+    gateway: 192.168.1.1
+    beta: false
+`
+
+Also note:
+Where previously we used `plex: plex`, we can now just use `plex:`
+
+### Blueprints
+
+Every jail now requires a blueprint to be defined. for example:
+v1.1.x
+`
+
+plex: plex
+  ip4_addr: 192.168.1.99/24
+  gateway: 192.168.1.1
+  plexpass: false
+`
+
+In v1.2.x becomes:
+`
+jail:
+  plex: 
+    blueprint: plex
+    ip4_addr: 192.168.1.99/24
+    gateway: 192.168.1.1
+    beta: false
+`
+
+### Plex
+
+Due to community feedback in v1.2.x "plexpass" has been renamed to "beta".
+
+### pkgs
+
+pkgs are removed from jail config in v1.2.x and are now part of the blueprint. This way we can keep them up-to-date for you.
+
+### Documentation
+
+All jails now have wiki documentation pages and all basic jail values have been documented
+
+### Other changes
+
+Some other minor changes in config file values have been done, please refer to the example document and compare your config to the example