Clarifies how to configure and access the dashboard in the api & dashboard documentations

docs/content/migration/v1-to-v2.md

@@ -824,7 +824,7 @@ Each root item has been moved to a related section or removed.
     
 ## Dashboard
 
-You need to activate the [API](../operations/dashboard.md#enabling-the-dashboard) to access the dashboard.
+You need to activate the API to access the [dashboard](../operations/dashboard.md).
 As the dashboard access is now secured by default you can either:
 
 * define a  [specific router](../operations/api.md#configuration) with the `api@internal` service and one authentication middleware like the following example

docs/content/operations/dashboard.md

@@ -10,17 +10,25 @@ The dashboard is the central place that shows you the current active routes hand
     <figcaption>The dashboard in action</figcaption>
 </figure>
 
-By default, the dashboard is available on `/dashboard` on port `:8080`.
-There is also a redirect of `/` to `/dashboard`, but one should not rely on that property as it is bound to change,
-and it might make for confusing routing rules anyway.
+The dashboard is available at the same location as the [API](./api.md) but on the path `/dashboard/` by default.
 
-!!! info "Did You Know?"
-    It is possible to customize the dashboard endpoint. 
-    To learn how, refer to the [API documentation](./api.md)
+!!! warning "The trailing slash `/` in `/dashboard/` is mandatory"
 
-## Enabling the Dashboard
+There are 2 ways to configure and access the dashboard:
 
-To enable the dashboard, you need to enable [Traefik's API](./api.md).
+- [Secure mode (Recommended)](#secure-mode)
+- [Insecure mode](#insecure-mode)
+
+!!! note ""
+    There is also a redirect of the path `/` to the path `/dashboard/`,
+    but one should not rely on that property as it is bound to change,
+    and it might make for confusing routing rules anyway.
+
+## Secure Mode
+
+This is the **recommended** method.
+
+Start by enabling the dashboard by using the following option from [Traefik's API](./api.md):
 
 ```toml tab="File (TOML)"
 [api]
@@ -51,12 +59,39 @@ api:
 --api.dashboard=true
 ```
 
-!!! important "API/Dashboard Security" 
+Then specify a router associated to the service `api@internal` to allow:
 
-    To secure your dashboard, the use of a `service` named `api@internal` is mandatory and requires the definition of a router using one or more security [middlewares](../middlewares/overview.md)
-    like authentication ([basicAuth](../middlewares/basicauth.md) , [digestAuth](../middlewares/digestauth.md), [forwardAuth](../middlewares/forwardauth.md)) or [whitelisting](../middlewares/ipwhitelist.md).  
-    More information about `api@internal` can be found in the [API documentation](./api.md#configuration)
+- Defining one or more security features through [middlewares](../middlewares/overview.md)
+  like authentication ([basicAuth](../middlewares/basicauth.md) , [digestAuth](../middlewares/digestauth.md),
+  [forwardAuth](../middlewares/forwardauth.md)) or [whitelisting](../middlewares/ipwhitelist.md).
 
-!!! info "Did You Know?"
-    The API provides more features than the Dashboard. 
-    To learn more about it, refer to the [API documentation](./api.md)
+- Defining your own [HTTP routing rule](../../routing/routers/#rule) for accessing the dashboard,
+  through Traefik itself (sometimes referred as "Traefik-ception").
+
+Please visit the ["Configuration" section of the API documentation](./api.md#configuration)
+to learn about configuring a router with the service `api@internal` and enabling the security features.
+
+## Insecure Mode
+
+This mode is not recommended because it does not allow the use of security features.
+
+To enable the "insecure mode", use the following options from [Traefik's API](./api.md#insecure):
+
+```toml tab="File (TOML)"
+[api]
+  dashboard = true
+  insecure = true
+```
+
+```yaml tab="File (YAML)"
+api:
+  dashboard: true
+  insecure: true
+```
+
+```bash tab="CLI"
+--api.dashboard=true --api.insecure=true
+```
+
+You can now access the dashboard on the port `8080` of the Traefik instance,
+at the following URL: `http://<Traefik IP>:8080/dashboard/` (trailing slash is mandatory).