feat(convert): PowerPoint conversion (#152)

* feat(convert): PowerPoint conversion 

You can now convert your presentations to PowerPoint

* fix(deps): push poetry lock

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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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

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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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/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}