Update links to tera template engine website

Author: colinkiama

README.md

@@ -66,5 +66,5 @@ You can find out more about humans.txt at: https://humanstxt.org/.
 ## Additional Resources
 
 - [Zola Documentation](https://www.getzola.org/documentation/getting-started/overview/)
-- [Tera Documentation](https://tera.netlify.app/docs/)
+- [Tera Documentation](https://keats.github.io/tera/)
 - [MDN Web Docs](https://developer.mozilla.org)

docs/1-overview.md

@@ -18,7 +18,7 @@
 - The website is a static site and is generated using [Zola](https://www.getzola.org/)
   - Extremely fast (written in Rust)
   - Is a single binary with no dependencies (Very simple to install)
-- Pages templates are powered by the [Tera templating engine](https://tera.netlify.app/)
+- Pages templates are powered by the [Tera templating engine](https://keats.github.io/tera/)
 - Page content is written using the [CommonMark](https://commonmark.org/) implementation of [markdown](https://daringfireball.net/projects/markdown/)
   - Markdown files are human readable
   - Simple syntax