Remove GitHub Pages publishing workflow for OpenAPI spec (#70)

* Initial plan

* Remove OpenAPI spec publishing workflow and update documentation

Co-authored-by: zmoog <25941+zmoog@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: zmoog <25941+zmoog@users.noreply.github.com>

Author: Copilot

.github/workflows/openapi-docs.yml

@@ -12,13 +12,6 @@ The `openapi.yaml` file is a machine-readable API specification that describes a
 
 ### 1. View Interactive Documentation
 
-#### Online (GitHub Pages)
-The API documentation is automatically published to GitHub Pages:
-
-🔗 **https://zmoog.github.io/classeviva/**
-
-This is updated automatically whenever the `openapi.yaml` file is changed on the `main` branch.
-
 #### Using Swagger UI Online
 1. Go to https://editor.swagger.io/
 2. Click "File" → "Import File"

OPENAPI.md

@@ -4,11 +4,9 @@ Classeviva is a Go library and CLI tool to access the popular school portal http
 
 ## OpenAPI Specification
 
-📖 **[View Interactive API Documentation](https://zmoog.github.io/classeviva/)**
-
 An [OpenAPI specification](openapi.yaml) is available that documents the Classeviva API endpoints. This specification can be used to:
 
-- **View interactive API documentation** - Automatically published to [GitHub Pages](https://zmoog.github.io/classeviva/)
+- **View interactive API documentation** - Use 3rd party tools like [Swagger Editor](https://editor.swagger.io/) or [Redocly](https://redocly.com/)
 - **Generate API clients** in your preferred programming language using tools like [OpenAPI Generator](https://openapi-generator.tech/)
 - **Understand API endpoints** and request/response formats