+ 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.

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.

+ Changes dark theme changes to a different css to respect future docfx.css changes
+ Merge featherlight plugin into the dark theme

Notable changes include the following,

+ Add _services into  examples.
+ Rename Commands back to commands.
    - This was changed in my previous PR; however, this made readability really weird.
+ Fix broken examples.
+ Directly referencing anchors instead of saying 'see this below'