feat(docs): Populate Developer Portal with comprehensive documentation framework (#35217)

Co-authored-by: Claude <noreply@anthropic.com>

docs/developer_portal/coding-guidelines/overview.md

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+---
+title: Coding Guidelines Overview
+sidebar_position: 1
+---
+
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
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+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
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+Unless required by applicable law or agreed to in writing,
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+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+# Coding Guidelines Overview
+
+🚧 **Coming Soon** 🚧
+
+Best practices and coding standards for Apache Superset development.
+
+## Topics to be covered:
+
+- General coding principles
+- Code organization
+- Error handling
+- Performance considerations
+- Security best practices
+- Testing requirements
+- Documentation standards
+- Commit message conventions
+
+---
+
+*This documentation is under active development. Check back soon for updates!*