chore(docs): update faq page

docs/source/faq.md

@@ -17,19 +17,45 @@ your own issue or discussion on GitHub!
 Everything related to installing Manim-Slides.
 
 Please do not forget the carefully read through
-the ... page!
+the [installation](/installation) page!
-
-###
 
 ## Rendering
 
-##
+Questions related to `manim-slides render [SCENES]...`,
+
+### I cannot render with ManimGL
+
+ManimGL support is only garanteed to work
+on a very minimal set of versions, because it differs quite a lot from ManimCE,
+and its development is not very active.
+
+The typical issues are that (1) ManimGL needs an outdated NumPy version
+and (2) ManimGL **should not** be installed from the GitHub repository,
+at least not from the `main` branch, but from a version released to PyPI.
+
+To solve the NumPy issue, you can safely downgrade NumPy to a version supported
+by ManimGL,
+while ignoring the possible *conflicting dependencies* messages from `pip` (or else).
 
 ### Presenting
 
+Questions related to `manim-slides present [SCENES]...`,
+or `manim-slides [SCENES]...` for short.
 
+### Can I have interactive slides
 
-## F.A.Q
+No. Slides are pre-rendered static videos files
+and cannot be modified on the fly.
+
+If you need new to have some kind of interactive, look
+at the preview feature coupled with the OpenGL renderer
+with ManimCE or ManimGL.
+
+### Slides go black when video finishes
+
+This is an issue with Qt,
+which cannot be solve on all platforms and Python versions,
+see [#293](https://github.com/jeertmans/manim-slides/issues/293).
 
 ### How to increase quality on Windows
 
@@ -41,7 +67,56 @@ in [#20](https://github.com/jeertmans/manim-slides/issues/20),
 the problem can be addressed by changing the scaling factor to 100%:
 
 <p align="center">
-  <img alt="Windows Fix Scaling" src="https://raw.githubusercontent.com/jeertmans/manim-slides/main/static/windows_quality_fix.png">
+  <img
+    alt="Windows Fix Scaling"
+    src="https://raw.githubusercontent.com/jeertmans/manim-slides/main/static/windows_quality_fix.png"
+  >
 </p>
 
 in *Settings*->*Display*.
+
+## Converting to any format
+
+Questions that apply to all output formats when using
+`manim-slides convert [SCENES]...`.
+
+### What are all possible configuration options
+
+Configuration options can be specified with the syntax
+`-c<option_name>=<option_value>`.
+
+To list all accepted options, use `manim-slides convert --to=FORMAT --show-config`,
+where `FORMAT` is one of the supported formats.
+This will also show the default value for each option.
+
+### How to retrieve the current template
+
+If you want to create your own template, the best is to start from the default one.
+
+You can either download it from the
+[template folder](https://github.com/jeertmans/manim-slides/tree/main/manim_slides/templates)
+or use the `manim-slides convert --to=FORMAT --show-template` command,
+where `FORMAT` is one of the supported formats.
+
+## Converting to HTML
+
+Questions related to `manim-slides convert [SCENES]... output.html`.
+
+### I moved my `.html` file and it stopped working
+
+If you did not specify `-cdata_uri=true` when converting,
+then Manim Slides generated a folder containing all
+the video files, in the same folder as the HTML
+output. As the path to video files is a relative path,
+you need to move the HTML **and its assets** altogether.
+
+## Converting to PPTX
+
+Questions related to `manim-slides convert [SCENES]... output.pptx`.
+
+### My media stop playing after a few slides
+
+This issue is (probably) caused by PowerPoint never freeing
+memory, causing memory allocation errors, and can be partially
+solved by reducing the video quality or the number of slides,
+see [#392](https://github.com/jeertmans/manim-slides/issues/392).