Documentation: manual installation of manim as a local package (#4456)

* Documentation: additonal instalation method

* Typo fix

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

for more information, see https://pre-commit.ci

* docs: simplify dev-install section and restore PR template checklist

---------

Co-authored-by: CA3000 <93896083+CA3000@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Benjamin Hackl <devel@benjamin-hackl.at>

Author: 4 people

docs/source/installation/uv.md

@@ -329,3 +329,13 @@ version satisfies the requirement. Change the line to, for example
 to pin the python version to `3.12`. Finally, run `uv sync`, and your
 environment is updated!
 :::
+
+:::{dropdown} Installing the latest development version
+If you want to install the latest (potentially unstable!)
+development version of Manim from our source repository
+[on GitHub](https://github.com/ManimCommunity/manim), then
+simply run
+```bash
+uv add git+https://github.com/ManimCommunity/manim.git@main
+```
+:::