fix(lib): Manim fixes, bump to >= 0.18, and tests (#447)

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---------

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

docs/source/gallery.md

@@ -23,10 +23,10 @@ using Manim Slides presentations.
 
 Daniel publishes his presentations on *Cosmology, String Theory and related*
 topics on his
-[personal website](https://panopepino.github.io/web_page/main_page/slides.html).
+[personal website](https://panopepino.github.io/Web_Page/main_page/slides.html).
 
 For example, below are the slides of a seminar he gave titled
-[Our Universe on a (Dark) Bubble](https://panopepino.github.io/web_page/main_page/presentations/2023_11_long/LS.html).
+[Our Universe on a (Dark) Bubble](https://panopepino.github.io/Web_Page/main_page/presentations/2023_11_long/LS.html).
 
 <div style="position:relative;padding-bottom:56.25%;">
     <iframe

docs/source/installation.md

@@ -108,8 +108,6 @@ using optional dependencies:
 
 - `full`, to include `magic`, `manim`, and
   `sphinx-directive` extras (see below);
-- `full-gl`, to include `magic`, `manimgl`, and
-  `sphinx-directive` extras (see below);
 - `magic`, to include a Jupyter magic to render
   animations inside notebooks. This automatically installs `manim`,
   and does not work with ManimGL;