update license information

Author: hitblast

book/src/guidelines/contributing.md

@@ -99,7 +99,3 @@ Possible types include:
 - refactor: Code refactoring without changing functionality
 - test: Test-related changes
 - chore: Maintenance or boring tasks
-
-## Licensing
-
-The primary repository and source code ([cutlerCLI/cutler](https://github.com/cutlerCLI/cutler)) is licensed under the [Apache-2.0](https://github.com/cutlerCLI/cutler/blob/master/LICENSE.md) license.

book/src/references/license.md

@@ -1,3 +1,9 @@
 # License
 
-This project is licensed under the Apache 2.0 License - see the [LICENSE.md](https://github.com/cutlerCLI/cutler/blob/master/LICENSE.md) file for details.
+This project is dual-licensed:
+
+- **Open Source License:** [GNU General Public License v3.0 or later (GPLv3)](https://github.com/cutlerCLI/cutler/blob/master/LICENSE.md)
+- **Commercial License:** See [COMMERCIAL_LICENSE.md](https://github.com/cutlerCLI/cutler/blob/master/COMMERCIAL_LICENSE.md) for terms
+
+You may choose either license for your use case.
+For commercial licensing or support, contact **Anindya Shiddhartha** at [hitblastlive@gmail.com](mailto:hitblastlive@gmail.com).

index.html

@@ -208,7 +208,7 @@ <h2>Join the Community</h2>
                 <a
                     href="https://github.com/cutlerCLI/cutler/blob/master/LICENSE.md"
                     target="_blank"
-                    >Apache-2.0</a
+                    >GNU General Public License v3.0 (commercial available)</a
                 >
             </div>
             <div style="margin-bottom: 0.5em">