docs(quickstart) Add pipx, uv, and uvx installation options

Expand developmental releases section to include pipx, uv, and uvx
installation methods alongside pip. Also add trunk installation options
for pipx and uv. Commands do not reference specific prerelease versions,
following the pattern used in vcspull.

Author: tony

docs/quickstart.md

@@ -30,6 +30,24 @@ In their versions you will see notification like `a1`, `b1`, and `rc1`, respecti
   $ pip install --user --upgrade --pre gp-libs
   ```
 
+- [pipx]\:
+
+  ```console
+  $ pipx install --suffix=@next 'gp-libs' --pip-args '\--pre' --force
+  ```
+
+- [uv]\:
+
+  ```console
+  $ uv add gp-libs --prerelease allow
+  ```
+
+- [uvx]\:
+
+  ```console
+  $ uvx --from 'gp-libs' --prerelease allow gp-libs
+  ```
+
 via trunk (can break easily):
 
 - [pip]\:
@@ -38,4 +56,19 @@ via trunk (can break easily):
   $ pip install --user -e git+https://github.com/git-pull/gp-libs.git#egg=gp-libs
   ```
 
+- [pipx]\:
+
+  ```console
+  $ pipx install --suffix=@master 'gp-libs @ git+https://github.com/git-pull/gp-libs.git@master' --force
+  ```
+
+- [uv]\:
+
+  ```console
+  $ uv add gp-libs --from git+https://github.com/git-pull/gp-libs.git
+  ```
+
 [pip]: https://pip.pypa.io/en/stable/
+[pipx]: https://pypa.github.io/pipx/docs/
+[uv]: https://docs.astral.sh/uv/
+[uvx]: https://docs.astral.sh/uv/guides/tools/