feat(convert): PowerPoint conversion (#152)

* feat(convert): PowerPoint conversion 

You can now convert your presentations to PowerPoint

* fix(deps): push poetry lock

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* fix(lint): ignore attr-defined because Windows-only

* chore(convert): autoplay media

* fix(convert): autoplay and autoloop

* chore(deps): update lock file

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* feat(convert): use first frame as default poster frame

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* chore(docs): document new feature

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/source/features_table.md

@@ -0,0 +1,25 @@
+# Features Table
+
+The following summarizes the different presentation features Manim Slides offers.
+
+:::{table} Comparison of the different presentation methods.
+:widths: auto
+:align: center
+
+| Feature / Constraint | [`present`](reference/cli.md) | [`convert --to=html`](reference/cli.md) | [`convert --to=pptx`](reference/cli.md) |
+| :--- | :---: | :---: | :---: |
+| Basic navigation through slides | Yes | Yes | Yes |
+| Replay slide | Yes | No | No |
+| Pause animation | Yes | No | No |
+| Play slide in reverse | Yes | No | No |
+| Needs Python with Manim Slides installed | Yes | No | No |
+| Requires internet access | No | Yes | No |
+| Auto. play slides | Yes | Yes | Yes |
+| Loops support | Yes | Yes | Yes |
+| Fully customizable | No | Yes (`--use-template` option) | No |
+| Other dependencies | None | A modern web browser | PowerPoint or LibreOffice Impress[^1]
+| Works cross-platforms | Yes | Yes | Partly[^1][^2] |
+:::
+
+[^1]: If you encounter a problem where slides do not automatically play or loops do not work, please [file an issue on GitHub](https://github.com/jeertmans/manim-slides/issues/new/choose).
+[^2]: PowerPoint online does not seem to support automatic playing of videos, so you need LibreOffice Impress on Linux platforms.

docs/source/index.md

@@ -39,6 +39,7 @@ Slide through the demo below to get a quick glimpse on what you can do with Mani
 
 quickstart
 reference/index
+features_table
 ```
 
 ```{toctree}

docs/source/reference/sharing.md

@@ -147,3 +147,17 @@ to know how to share your slide with GitHub pages, see the
 > **WARNING:** keep in mind that playing large video files over the internet
 can take some time, and *glitches* may occur between slide transitions for this
 reason.
+
+### With PowerPoint (*EXPERIMENTAL*)
+
+A recent conversion feature is to the PowerPoint format, thanks to the `python-pptx` package. Even though it is fully working, it is still considered in an *EXPERIMENTAL* status because we do not exactly know what versions of PowerPoint (or LibreOffice Impress) are supported.
+
+Basically, you can create a PowerPoint in a single command:
+
+```bash
+manim-slides convert --to=pptx BasicExample basic_example.pptx
+```
+
+All the videos and necessary files will be contained inside the `.pptx` file, so you can safely share it with anyone. By default, the `poster_frame_image`, i.e., what is displayed by PowerPoint when the video is not playing, is the first frame of each slide. This allows for smooth transitions.
+
+In the future, we hope to provide more features to this format, so feel free to suggest new features too!