Refactor doc pages

docs/backends/dynamodb.md

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+# DynamoDB backend
+
+Træfik can be configured to use Amazon DynamoDB as a backend configuration:
+
+
+```toml
+################################################################
+# DynamoDB configuration backend
+################################################################
+
+# Enable DynamoDB configuration backend
+#
+# Optional
+#
+[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.