Update README.md

Author: jeertmans

README.md

@@ -38,23 +38,41 @@ template. Once you are logged in, click on:
 </picture>
 </p>
 
-
-### Your presentation
+### Customizing your presentation
 
 By default, the generated presentation is obtained from the
 [`slides.py`](./slides.py) file, uses Manim Community Edition,
 and renders the following scenes: `Introduction`, `WithTeX`,
 ans `Outro`.
 
-### Customizing
+Of course, you can update or create Python files to
+generate your animations. If you require a specific
+version of `manim-slides`, `manim` or `manimlib`,
+please edit [`requirements.txt`](./requirements.txt).
+
+Additionally, you can edit the following environ variables
+to reflect your changes:
 
 https://github.com/jeertmans/manim-slides-starter/blob/bd59f1e3da1eb12e2587898aaedf51c7f779501a/.github/workflows/deploy_pages.yml#L19-L22
 
-## Where is the output?
+> **WARNING**: `manimgl` is currently not supported, as rendering animations
+> inside GitHub workflows seems complex...
 
-If everything goes well,
+## Where is the output?
 
 On every commit to the `main` branch, a new deployment action should be
-triggered. If that is not the case, inspect the [actions](./actions) tab for
+triggered. If that is not the case, inspect the [actions](../../actions) tab for
 any error message. You can also manually trigger a deployment by clicking on
-the [*Run workflow*](./actions/workflows/deploy_pages.yml) button.
+the [*Run workflow*](../../actions/workflows/deploy_pages.yml) button.
+
+If everything goes well, the deploying site should be on your
+personal GitHub pages site: `https://<username>.github.io/<repository_name>`.
+
+For example, this starter's website is:
+https://jeertmans.github.io/manim-slides-starter.
+
+> NOTE: the first time the deployment action is used,
+> the `gh-pages` branch is created. You might need
+> to go to [`Settings -> Pages`](../../settings/pages)
+> and make sure that the *Source* is
+> *Deploy from a branch*, and *branch* is *gh-pages*.