* Change passive voice in "Get Started" to active
* Fix improper preposition in Commands Introduction page
* Fix minor grammar mistakes in "Your First Bot" (future tense -> present tense/subjunctive mood -> indicative mood/proper noun casing/incorrect noun/add missing article)
* Fix minor grammar mistakes in "Installation" (missing article)

+ Increase line-height to make pages look less squished.
+ Add master stylesheet.
	- Move content that are not theme-specific to master CSS.
+ Target latest featherlight.js instead of 1.7.6.
+ Add javascript for cornerifying images.
+ Add escape mention image, courtesy of @Andrewww1.