Proposed changes

I replace all the master by main in the links of the repositories of nuclei and nuclei-templates.

I did it initially to replace the TemplatesRepoURL = "https://github.com/projectdiscovery/nuclei-templates/blob/master/" because the new branch is main and new templates are only existing on main. Therefore, in the template-url field when using -json, the link was linking to a 404 or not the latest version of the template.

For example:

• The link for the template CVE-2022-43140.yaml, was https://github.com/projectdiscovery/nuclei-templates/blob/master/cves/2022/CVE-2022-43140.yaml which redirects to a 404
• The real link is on main https://github.com/projectdiscovery/nuclei-templates/blob/main/cves/2022/CVE-2022-43140.yaml

Out of consistency, I did it for the documentation and more files too.

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)