add helpful links to vagrant install doc
Add external link icon with JS
Merge pull request #2241 from darkwing/stealth-buttons

Add external link icon with JS
Fix small font size for code samples
Merge pull request #2247 from groovecoder/code-samples-font-size

Fix small font size for code samples
Merge pull request #2237 from groovecoder/link-vagrant-install-doc

add helpful links to vagrant install doc