Include bash style guide (#311)

* Update index.md

Co-authored-by: docs-sourcer[bot] <99042413+docs-sourcer[bot]@users.noreply.github.com>

Author: rhoboat

_docs-sources/guides/style/index.md

@@ -20,5 +20,11 @@ Learn Gruntwork's Go coding style.
   href="/guides/style/markdown-style-guide">
 Learn how Gruntwork formats our READMEs and documentation.
 </Card>
+<Card
+  title="Bash Style Guide"
+  href="https://google.github.io/styleguide/shellguide.html">
+Gruntwork follows Google's shell style guide for Bash scripts.
+</Card>
+  
 
 </CardGroup>

docs/guides/style/index.md

@@ -20,13 +20,19 @@ Learn Gruntwork's Go coding style.
   href="/guides/style/markdown-style-guide">
 Learn how Gruntwork formats our READMEs and documentation.
 </Card>
+<Card
+  title="Bash Style Guide"
+  href="https://google.github.io/styleguide/shellguide.html">
+Gruntwork follows Google's shell style guide for Bash scripts.
+</Card>
+  
 
 </CardGroup>
 
 
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