Documentation Revamp

Co-authored-by: jbdoumenjou <jb.doumenjou@gmail.com>

docs/content/operations/cli.md

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+# CLI
+
+The Traefik Command Line
+{: .subtitle }
+
+## General
+
+```bash
+traefik [command] [--flag=flag_argument]
+```
+
+Available commands: 
+
+- `version` : Print version
+- `storeconfig` : Store the static Traefik configuration into a Key-value stores. Please refer to the `Store Traefik configuration`(TODO: add doc and link) section to get documentation on it.
+- `bug`: The easiest way to submit a pre-filled issue.
+- `healthcheck`: Calls Traefik `/ping` to check health.
+
+Each command can have additional flags.
+
+All those flags will be displayed with:
+
+```bash
+traefik [command] --help
+```
+
+Each command is described at the beginning of the help section:
+
+```bash
+traefik --help
+
+# or
+
+docker run traefik[:version] --help
+# ex: docker run traefik:1.5 --help
+```
+
+## Command: bug
+
+The easiest way to submit a pre-filled issue on [Traefik GitHub](https://github.com/containous/traefik)! Watch [this demo](https://www.youtube.com/watch?v=Lyz62L8m93I) for more information.
+
+```bash
+traefik bug
+```
+
+### Command: healthcheck
+
+Checks the health of Traefik.
+Its exit status is `0` if Traefik is healthy and `1` if it is unhealthy.
+
+This can be used with Docker [HEALTHCHECK](https://docs.docker.com/engine/reference/builder/#healthcheck) instruction or any other health check orchestration mechanism.
+
+!!! note
+    The [`ping` endpoint](../ping/) must be enabled to allow the `healthcheck` command to call `/ping`.
+
+```bash
+traefik healthcheck
+```
+
+```bash
+OK: http://:8082/ping
+```

docs/content/operations/dashboard.md

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+# The Dashboard
+
+See What's Going On
+{: .subtitle }
+
+The dashboard is the central place that shows you the current active routes handled by Traefik. 
+
+<figure>
+   <img src="../../assets/img/dashboard-main.png" alt="Dashboard - Providers" />
+   <figcaption>The dashboard in action with Traefik listening to 3 different providers</figcaption>
+</figure>
+
+<figure>
+   <img src="../../assets/img/dashboard-health.png" alt="Dashboard - Health" />
+   <figcaption>The dashboard shows the health of the system.</figcaption>
+</figure>
+
+By default, the dashboard is available on `/` on port `:8080`.
+
+!!! tip "Did You Know?"
+    It is possible to customize the dashboard endpoint. 
+    To learn how, refer to the `Traefik's API documentation`(TODO: add doc and link).
+    
+## Enabling the Dashboard
+
+To enable the dashboard, you need to enable Traefik's API.
+
+??? example "Using the Command Line"
+
+    Option | Values | Default Value 
+    -- | -- | --:
+    --api | \[true\|false\] | false
+    --api.dashboard | \[true\|false\] | true when api is true 
+    
+    {!more-on-command-line.md!}
+
+??? example "Using the Configuration File"
+
+    ```toml
+    [api] 
+      # Dashboard
+      #
+      # Optional
+      # Default: true
+      #
+      dashboard = true
+    ```
+    
+    {!more-on-configuration-file.md!}
+
+??? example "Using a Key/Value Store"
+
+    Key | Values | Default Value
+    -- | -- | --:
+    api | \[true\|false\] | false
+    api.dashboard | \[true\|false\] | true when api is true 
+    
+    {!more-on-key-value-store.md!}
+    
+!!! tip "Did You Know?"
+    The API provides more features than the Dashboard. 
+    To learn more about it, refer to the `Traefik's API documentation`(TODO: add doc and link).

docs/content/operations/debug-mode.md

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+# The Debug Mode
+
+Getting More Information (Not For Production)
+{: .subtitle }
+
+The debug mode will make Traefik be _extremely_ verbose in its logs, and is NOT intended for production purposes.
+
+## Configuration Example
+
+??? example "TOML -- Enabling the Debug Mode"
+
+    ```toml
+    [Global]
+       debug = true
+    ```

docs/content/operations/ping.md

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+# Ping
+
+Checking the Health of Your Traefik Instances
+{: .subtitle }
+
+## Configuration Examples
+
+??? example "Enabling /ping on the http EntryPoint"
+
+    ```toml
+    [entryPoints]
+       [entrypoints.http]
+          address = ":80"
+    
+    [ping]
+      entryPoint = "http"
+    ```
+
+??? example "Enabling /ping on the https EntryPoint"
+
+    ```toml
+    [entryPoints]
+       [entryPoints.http]
+          address = ":80"
+
+      [entryPoints.https]
+         address = ":443"
+         [entryPoints.https.tls]   
+    
+    [ping]
+      entryPoint = "https"
+    ```
+
+??? example "Enabling /ping on a dedicated EntryPoint"
+    
+    ```toml    
+    [entryPoints]
+      [entryPoints.http]
+        address = ":80"
+      
+      [entryPoints.ping]
+        address = ":8082"
+    
+    [ping]
+        entryPoint = "ping"
+    ```
+
+| Path    | Method        | Description                                                                                        |
+|---------|---------------|----------------------------------------------------------------------------------------------------|
+| `/ping` | `GET`, `HEAD` | A simple endpoint to check for Traefik process liveness. Return a code `200` with the content: `OK` |
+
+## Configuration Options
+
+The `/ping` health-check URL is enabled with the command-line `--ping` or config file option `[ping]`.
+
+You can customize the `entryPoint` where the `/ping` is active with the `entryPoint` option (default value: `traefik`)