website/docs: add note for trailing-slash in initial setup (#12583)

* docs: add note for trailing-slash in initial setup

Signed-off-by: Mahmoud Abduljawad <mahmoud@masaar.com>

* docs: add note for trailing-slash in k8s initial setup

Signed-off-by: Mahmoud Abduljawad <mahmoud@masaar.com>

* docs: refactor to use admonition syntax

Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Signed-off-by: Mahmoud Abduljawad <abduljawad.mahmoud@gmail.com>

* docs: update wording

Signed-off-by: Mahmoud Abduljawad <mahmoud@masaar.com>

* docs: update wording

Signed-off-by: Mahmoud Abduljawad <mahmoud@masaar.com>

* docs: reword for natural language

Co-authored-by: 4d62 <git@sdko.org>
Signed-off-by: Mahmoud Abduljawad <abduljawad.mahmoud@gmail.com>

* docs: reword for natural language

Signed-off-by: Mahmoud Abduljawad <mahmoud@masaar.com>

* docs: typo

Satisfy `codespell` by changing "falsy" to "false".

---------

Signed-off-by: Mahmoud Abduljawad <mahmoud@masaar.com>
Signed-off-by: Mahmoud Abduljawad <abduljawad.mahmoud@gmail.com>
Co-authored-by: Tana M Berry <tanamarieberry@yahoo.com>
Co-authored-by: 4d62 <git@sdko.org>

website/docs/install-config/install/docker-compose.mdx

@@ -117,6 +117,10 @@ The `docker-compose.yml` file statically references the latest version available
 
 To start the initial setup, navigate to `http://<your server's IP or hostname>:9000/if/flow/initial-setup/`.
 
+:::info
+You will get `Not Found` error if initial setup URL doesn't include the trailing forward slash `/`. Make sure you use the complete url (`http://<your server's IP or hostname>:9000/if/flow/initial-setup/`) including the trailing forward slash.
+:::
+
 There you are prompted to set a password for the `akadmin` user (the default user).
 
 For an explanation about what each service in the docker compose file does, see [Architecture](../../core/architecture.md).