Reorganized Docs. In Progress.

docs/Snap/Sharing-MongoDB.md

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+## Share MongoDB to other snaps
+
+- connect mongodb-slot with plug from corresponding snap(s)
+- configure corresponding service to use mongodb unix socket in shared directory, socket file name is: mongodb-.sock
+
+## Sharing MongoDB from other snap to wekan
+- connect mongodb-plug with slot from snap providing mongodb
+- disable mongodb in wekan by calling:
+
+```
+$ snap set wekan set disable-mongodb='true'
+```
+
+- set mongodb-bind-unix-socket to point to serving mongodb. Use relative path inside shared directory, e.g run/mongodb-27017.sock