doc: structural review

- user-guide review.
- add DataDog and StatD configuration.
- sync sample.toml and doc.
- split entry points doc.
- Deprecated.

docs/configuration/backends/dynamodb.md

@@ -0,0 +1,63 @@
+# DynamoDB Backend
+
+Træfik can be configured to use Amazon DynamoDB as a backend configuration:
+
+```toml
+################################################################
+# DynamoDB configuration backend
+################################################################
+
+# Enable DynamoDB configuration backend
+[dynamodb]
+
+# DyanmoDB Table Name
+#
+# Optional
+#
+TableName = "traefik"
+
+# Enable watch DynamoDB changes
+#
+# Optional
+#
+Watch = true
+
+# Polling interval (in seconds)
+#
+# Optional
+#
+RefreshSeconds = 15
+
+# Region to use when connecting to AWS
+#
+# Required
+#
+Region = "us-west-1"
+
+# AccessKeyID to use when connecting to AWS
+#
+# Optional
+#
+AccessKeyID = "abc"
+
+# SecretAccessKey to use when connecting to AWS
+#
+# Optional
+#
+SecretAccessKey = "123"
+
+# Endpoint of local dynamodb instance for testing
+#
+# Optional
+#
+Endpoint = "http://localhost:8080"
+```
+
+Items in the `dynamodb` table must have three attributes: 
+
+- `id` (string): The id is the primary key.
+- `name`(string): The name is used as the name of the frontend or backend.
+- `frontend` or `backend` (map): This attribute's structure matches exactly the structure of a Frontend or Backend type in traefik.
+    See `types/types.go` for details.
+    The presence or absence of this attribute determines its type.
+    So an item should never have both a `frontend` and a `backend` attribute.