[doc] Update the URL of the documentation (#702)

CONTRIBUTING.md

@@ -4,12 +4,12 @@ Thank you for reading this documentation and considering making your contributio
 
 In order to help you understand the project, where we are heading and how you can contribute, below are several resources and answers.
 
-Do not hesitate to shoot us an [email](mailto:contact@opencti.io) or join us on our [Slack channel](https://luatix.slack.com/). Most of the articles below are an introduction for our [detailed documentation](https://opencti-platform.github.io/docs/introduction).
+Do not hesitate to shoot us an [email](mailto:contact@opencti.io) or join us on our [Slack channel](https://luatix.slack.com/). Most of the articles below are an introduction for our [detailed documentation](https://www.notion.so/OpenCTI-Public-Knowledge-Base-d411e5e477734c59887dad3649f20518).
 
 
 ## Why contribute?
 
-OpenCTI is an open source project aiming at building a platform for threat intelligence analysts, allowing them to capitalise, structure, organise and visualise amouts of information. It allows analysts to leverage knowlegde from these information while keeping track of each and every source of information (if you want to know more about OpenCTI, you can read the [detailed documentation](https://opencti-platform.github.io/docs/getting-started/introduction) or try it on the [demonstration plateform](https://demo.opencti.io/)). 
+OpenCTI is an open source project aiming at building a platform for threat intelligence analysts, allowing them to capitalise, structure, organise and visualise amouts of information. It allows analysts to leverage knowlegde from these information while keeping track of each and every source of information (if you want to know more about OpenCTI, you can read the [detailed documentation](https://www.notion.so/OpenCTI-Public-Knowledge-Base-d411e5e477734c59887dad3649f20518) or try it on the [demonstration plateform](https://demo.opencti.io/)). 
 
 Whether you are an organisation or an individual working or studying in the field of cybersecurity and cyberdefense, or simply as an individual looking for a technical challenge, contributing to the OpenCTI project may represent a great opportunity for you.
 
@@ -46,7 +46,7 @@ For general suggestions or questions about the project or the documentation, you
 
 * You can look through opened issues and help triage them (ask for more information, suggest workarounds, suggest label, flag issues etc.)
 
-* If you are interested in contributing to developping OpenCTI, please refer to the [detailed documentation](https://opencti-platform.github.io/docs/getting-started/introduction). It can be either a to fix an issue which is meaningful to you, or to develop a feature requested by others.
+* If you are interested in contributing to developping OpenCTI, please refer to the [detailed documentation](https://www.notion.so/OpenCTI-Public-Knowledge-Base-d411e5e477734c59887dad3649f20518). It can be either a to fix an issue which is meaningful to you, or to develop a feature requested by others.
 
 * All commits messages must be formatted as: `[component] Message (#issuenumber)` where component should be:
   * api