Migrate repository from GitHub to Gitea

- Update paper repository URL to git.marketally.com
- Update contributing guide with Gitea URLs and instructions
- Update repository links to point to new Gitea location

CONTRIBUTING.md

@@ -24,15 +24,15 @@ By participating in this project, you agree to abide by our Code of Conduct:
 
 ## Getting Started
 
-1. Fork the repository on GitHub
+1. Fork the repository on Gitea
 2. Clone your fork locally:
    ```bash
-   git clone https://github.com/YOUR_USERNAME/sqrtspace-dotnet.git
+   git clone https://git.marketally.com/YOUR_USERNAME/sqrtspace-dotnet.git
    cd sqrtspace-dotnet/sqrtspace-dotnet
    ```
 3. Add the upstream remote:
    ```bash
-   git remote add upstream https://github.com/sqrtspace/sqrtspace-dotnet.git
+   git remote add upstream https://git.marketally.com/sqrtspace/sqrtspace-dotnet.git
    ```
 
 ## Development Setup
@@ -68,9 +68,9 @@ dotnet test
 
 ### Finding Issues to Work On
 
-- Check issues labeled [`good first issue`](https://github.com/sqrtspace/sqrtspace-dotnet/labels/good%20first%20issue)
-- Look for [`help wanted`](https://github.com/sqrtspace/sqrtspace-dotnet/labels/help%20wanted) labels
-- Review the [project roadmap](https://github.com/sqrtspace/sqrtspace-dotnet/projects)
+- Check issues labeled [`good first issue`](https://git.marketally.com/sqrtspace/sqrtspace-dotnet/issues?q=&type=all&state=open&labels=good+first+issue)
+- Look for [`help wanted`](https://git.marketally.com/sqrtspace/sqrtspace-dotnet/issues?q=&type=all&state=open&labels=help+wanted) labels
+- Review the [project milestones](https://git.marketally.com/sqrtspace/sqrtspace-dotnet/milestones)
 
 ## Coding Standards
 
@@ -222,8 +222,8 @@ For feature requests, please include:
 
 ## Questions?
 
-- Open a [Discussion](https://github.com/sqrtspace/sqrtspace-dotnet/discussions)
-- Check existing [Issues](https://github.com/sqrtspace/sqrtspace-dotnet/issues)
+- Open an [Issue](https://git.marketally.com/sqrtspace/sqrtspace-dotnet/issues)
+- Check existing [Issues](https://git.marketally.com/sqrtspace/sqrtspace-dotnet/issues)
 
 ## License
 

README.md

@@ -5,7 +5,7 @@
 
 Memory-efficient algorithms and data structures for .NET using Williams' √n space-time tradeoffs. Reduce memory usage by 90-99% with minimal performance impact.
 
-**Paper Repository**: [github.com/sqrtspace/sqrtspace-paper](https://github.com/sqrtspace/sqrtspace-paper)  
+**Paper Repository**: [git.marketally.com/sqrtspace/sqrtspace-paper](https://git.marketally.com/sqrtspace/sqrtspace-paper)  
 
 ## Quick Start
 
@@ -718,7 +718,7 @@ Apache 2.0 - See [LICENSE](LICENSE) for details.
 ## Links
 
 - [NuGet Packages](https://www.nuget.org/profiles/sqrtspace)
-- [GitHub Repository
+- [Git Repository](https://git.marketally.com/sqrtspace/sqrtspace-dotnet)
 
 ---