OWASP/www-chapter-colombo: Page build failure

[danishka]

After updating Colombo chapter page repo [1], I noticed there was a page build failure.
I highly appreciate if you can help me to fix this.

The page build failed for the master` branch with the following error:

A file was included in /_layouts/col-sidebar.html that is a symlink or does not exist in your _includes directory. For more information, see https://docs.github.com/github/working-with-github-pages/troubleshooting-jekyll-build-errors-for-github-pages-sites#file-is-a-symlink.

For information on troubleshooting Jekyll see:

https://docs.github.com/articles/troubleshooting-jekyll-builds

If you have any questions you can submit a request at https://support.github.com/contact?repo_id=221790172&page_build_id=242477598

`
[1] https://github.com/OWASP/www-chapter-colombo