+ New config exposes Discord.Net namespace since it has several common public exceptions that may be helpful to users

+ DocFX by default ships with an older version of jQuery, switching to a newer version confuses parts of the DocFX Javascript.

+ Rename Guides.Concepts.Logging title from 'Logging' to 'Logging Events/Data'.
+ Rewrite various sections of Guides.GettingStarted.FirstBot and Guides.GettingStarted.Installing based on suggested changes from #1027.
+ Rename project.csproj example to project.xml to avoid auto-compilation from Visual Studio Code.
+ Rename 'samples\intro' to 'samples\first-bot' to reflect on the article name change.
+ Clean first-bot samples.

+ Each section has gone through a thorough proof-reading and cleanup
+ This should help with readability.

+ 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.

This change is because how our repo and project namespace uses .Net instead of .NET.
For consistency sake, we should refer to the project as Discord.Net.