Add Gutenberg alignleft, alignright classes to the existing align-left, align-right CSS

[benlk]

This is what an old module-wrapper pull quote looks like:

This is what a Pull Quote Block looks like:

• [ ] remove the vertical left border on the pull quote block
• [ ] add align-left and align-right here: https://github.com/INN/umbrella-energynewsnetwork/blob/78da2fa2c3a8e2918e346f938a02a7ac720e826c/wp-content/themes/midwestenergynews/less/single.less#L192-L202