chore: Update GitLab links to GitHub (#372)

* chore: Update GitLab links to GitHub

The project has moved from GitLab to GitHub so update the links.

Signed-off-by: Thanh Ha <zxiiro@gmail.com>

* Some additional fixes

Signed-off-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>

---------

Signed-off-by: Thanh Ha <zxiiro@gmail.com>
Signed-off-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>
Co-authored-by: Thomas Neidhart <thomas.neidhart@eclipse-foundation.org>

docs/contributing.md

@@ -2,18 +2,20 @@ We'd love you to contribute to Otterdog!
 
 ## Issues
 
-Questions, feature requests and bug reports are all welcome as [discussions or issues](https://gitlab.eclipse.org/eclipsefdn/security/otterdog/-/issues/new).
+Questions, feature requests and bug reports are all welcome as
+[discussions](https://github.com/eclipse-csi/otterdog/discussions) or
+[issues](https://github.com/eclipse-csi/otterdog/issues).
 
-## Merge Requests
+## Pull Requests
 
-It should be extremely simple to get started and create a Merge Request.
+It should be extremely simple to get started and create a Pull Request.
 
 Unless your change is trivial (typo, docs tweak etc.), please create an issue to discuss the change before
 creating a pull request.
 
 If you're looking for something to get your teeth into, check out the
-["help wanted"](https://gitlab.eclipse.org/eclipsefdn/security/otterdog/-/issues/?label_name%5B%5D=Help%20Wanted)
-label on gitlab.
+["help wanted"](https://github.com/eclipse-csi/otterdog/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22help%20wanted%22)
+label on GitHub.
 
 To make contributing as easy and fast as possible, you'll want to run tests and linting locally. Luckily,
 Otterdog has few dependencies, doesn't require compiling and tests don't need access to databases, etc.
@@ -23,22 +25,24 @@ Because of this, setting up and running the tests should be very simple.
 
 You'll need the following prerequisites:
 
-- Any Python version **>= 3.10**
+- Any Python version **>= 3.11**
 - **git**
 - **make**
 - [**poetry**](https://python-poetry.org/docs/#installation)
 
 ### Installation and setup
 
-Fork the repository on Gitlab and clone your fork locally.
+Fork the repository on GitHub and clone your fork locally.
 
 ```bash
 # Clone your fork and cd into the repo directory
-git clone https://gitlab.eclipse.org/<your username>/otterdog.git
+git clone https://github.com/<your username>/otterdog.git
 cd otterdog
 
 # Install poetry
 curl -sSL https://install.python-poetry.org | python3 -
+# or alternatively
+pipx install poetry
 
 # Install dependencies
 make init
@@ -65,7 +69,7 @@ make test
 
 ### Commit and push your changes
 
-Commit your changes, push your branch to Gitlab, and create a pull request.
+Commit your changes, push your branch to GitHub, and create a pull request.
 
 Please follow the pull request template and fill in as much information as possible. Link to any relevant issues and include a description of your changes.
 
@@ -81,7 +85,7 @@ Documentation is written in Markdown and built using [Material for MkDocs](https
 
 ### Code documentation
 
-When contributing to Pydantic, please make sure that all code is well documented. The following should be documented using properly formatted docstrings:
+When contributing to otterdog, please make sure that all code is well documented. The following should be documented using properly formatted docstrings:
 
 - Modules
 - Class definitions