[docs] Make 'Further Reading' sections consistent

Author: jankeromnes

src/docs/languages/bash.md

@@ -70,6 +70,6 @@ Not sure about Bash IDE? Try it in Gitpod
 
 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/gitpod-io/Gitpod-BashIDE)
 
-## External Resources
+## Further Reading
 
 - For more information about ShellCheck please see [shellcheck.net](https://shellcheck.net)

src/docs/languages/go.md

@@ -125,7 +125,7 @@ To see a basic repository with Go debugging enabled, please check out [gitpod-io
 
 [![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/gitpod-io/Gitpod-Go-Debug)
 
-## External Resources
+## Further Reading
 
 - [VSCode/Go Documentation](https://code.visualstudio.com/docs/languages/go) The stuff here also applies to Gitpod!
 - [VSCode/Go debugging](https://github.com/Microsoft/vscode-go/wiki/Debugging-Go-code-using-VS-Code) VSCode's Documentation on Go debugging

src/docs/languages/php.md

@@ -90,6 +90,6 @@ RUN sudo pecl channel-update pecl.php.net && \
 ``` 
 where `<EXTENSION>` is the PHP extension you want to install, e.g. `xdebug`.
 
-## External Resources
+## Further Reading
 
 - [Gitpodifying a new Laravel Application](https://notes.etin.space/posts/gitpodifying-a-new-laravel-application) by Etin Obaseki

src/docs/languages/python.md

@@ -153,7 +153,8 @@ To see a basic repository with Python debugging enabled, please check out [gitpo
 <br>
 
 
-## Resources
+## Further Reading
+
 * ***[VSCode documentation for Python debugging](https://code.visualstudio.com/docs/python/debugging)*** All the information there should also apply to Gitpod as well.
 * ***[Troubleshooting Matplotlib/TK](https://github.com/gitpod-io/gitpod/issues/795)*** Here is how to troubleshoot Matplotlib/TK issues for Python GUI applications.
 * ***[Debugging Django](https://community.gitpod.io/t/django-debugging/381/6)*** This is how to debug Django applications in Gitpod.

src/docs/languages/rust.md

@@ -223,5 +223,6 @@ To see a basic repository with Rust debugging configured, please check out [gitp
 
 <br>
 
-## Resources
+## Further Reading
+
 * ***[Rocket-Example](https://www.gitpod.io/blog/docker-in-gitpod/)*** For an example of how to setup a project for the [`Rocket`](https://rocket.rs/) web-development framework