Fix issue-743 by sanitizing the URL (#809)

<!-- Provide a brief summary of your changes -->
This PR aims to fix
https://github.com/modelcontextprotocol/registry/issues/743#event-20985516896

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->
This is needed to ensure we are sanitizing the URL before creating
server.json to be inline with the validations.

## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->
Tested via UTs and also tested CLI locally to ensure the expected
behavior.

## Breaking Changes
<!-- Will users need to update their code or configurations? -->

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
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-->

Co-authored-by: Avish Porwal <avishporwal@microsoft.com>

cmd/publisher/commands/init.go

@@ -213,6 +213,10 @@ func detectDescription() string {
 }
 
 func detectRepoURL() string {
+	sanitizeURL := func(url string) string {
+		return strings.TrimPrefix(url, "git+")
+	}
+
 	// Try git remote
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
@@ -233,11 +237,11 @@ func detectRepoURL() string {
 		if json.Unmarshal(data, &pkg) == nil {
 			if repo, ok := pkg["repository"].(map[string]any); ok {
 				if url, ok := repo["url"].(string); ok {
-					return strings.TrimSuffix(url, ".git")
+					return sanitizeURL(strings.TrimSuffix(url, ".git"))
 				}
 			}
 			if repo, ok := pkg["repository"].(string); ok {
-				return strings.TrimSuffix(repo, ".git")
+				return sanitizeURL(strings.TrimSuffix(repo, ".git"))
 			}
 		}
 	}