refactor: point to different docs for obtaining a github token for co…

…ntribution (#14125)

## What
<!--
* Describe what the change is solving.
* It helps to add screenshots if it affects the frontend.
-->
Even though the github docs lay out what to do when creating the token, Github's defaults make it _very_ easy to do it incorrectly anyway (I have watched this happen multiple times). 

@nataliekwong wrote docs with screenshots that seem more helpful than Github's docs - let's point to them instead. 

## Can this PR be safely reverted and rolled back?
<!--
* If you know that your be safely rolled back, check YES.*
* If that is not the case (e.g. a database migration), check NO.
* If unsure, leave it blank.*
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- [x] YES 💚
- [ ] NO ❌

airbyte-webapp/src/components/connectorBuilder/MenuBar/PublishModal.tsx

@@ -383,7 +383,7 @@ const ContributeToAirbyteForm: React.FC<ContributeToAirbyteFormProps> = ({ image
               <FormattedMessage id="connectorBuilder.contribution.modal.githubToken.subText" />
             </Text>
             <ExternalLink
-              href="https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens#creating-a-personal-access-token-classic"
+              href="https://docs.airbyte.com/contributing-to-airbyte/submit-new-connector#obtaining-your-github-access-token"
               className={styles.githubTokenLink}
               variant="primary"
             >