chore(docs): improving the docs (#115)

* chore(docs): improving the docs

This improves the docs as suggested by some reddit user. Now, most of Manim is documented in one place

* try: update lockfile

* chore(deps): remove duplicate key

* fix(ci): isort issue

See https://github.com/home-assistant/core/issues/86892

* fix(ci): bad identation

* fix(ci): fixing lock file

* fix(example): issue when ManimGL does not count wait as animation

docs/source/quickstart.md

@@ -0,0 +1,21 @@
+# Quickstart
+
+## Installation
+
+```{include} ../../README.md
+:start-after: <!-- start install -->
+:end-before: <!-- end install -->
+```
+
+## Creating your first slides
+
+```{include} ../../README.md
+:start-after: <!-- start usage -->
+:end-before: <!-- end usage -->
+```
+
+The output slides should look this this:
+
+<div style="position:relative;padding-bottom:56.25%;"> <iframe style="width:100%;height:100%;position:absolute;left:0px;top:0px;" frameborder="0" width="100%" height="100%" allowfullscreen allow="autoplay" src="_static/basic_example.html"></iframe></div>
+
+For more advanced examples, see the [Examples](reference/examples) section.