Markdown files do not accept apostrophes

[swaminator]

If your text content has an apostrophe ' the build fails. As an example

description: 'In this workshop **we'll** learn how to build cloud-enabled web applications with Angular & AWS Amplify.'
banner: './banner.png'

This will cause:

error Error processing Markdown file /Users/nsswamin/workspace/documentation/community/content/posts/2019-04-12-angular-workshop/index.md:

      can not read a block mapping entry; a multiline key may not be an implicit key at line 4, column 7:
    banner: './banner.png'
          ^
error Command failed with exit code 1.

[harrysolovay]

That's just how the MD is parsed. If wrapped with double quotes, the sentence shouldn't error out. Even with the apostrophe. Our MD linter should catch this class of build error.

[swaminator]

We need to figure out how to do this so reopening.