* Solved 4003 Authentication Error (Race Condition)

* Set static interval & removed hello case

+ This build adds the functionality of generating managed references' summary into the description tag.

+ Change title font to Noto Sans
+ Add materialized design for commit message box

+ Some contributions from @purpledank

* 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)

* Changed the path from 'lastmodified' to 'last-modified' for consistency

* Moved theme-switcher code to scripts partial file
+ Add author's MIT license to featherlight javascript

* InvalidPathChars does not exist in NS1.3; replaced with GetInvalidPathChars instead.

+ Add precondition usage sample
+ Add precondition group usage sample
+ Move precondition samples to its own sample folder

+ Fix various formatting.
+ Provide a more detailed walkthrough for dependency injection.
+ Add C# note at intro.

* ConnectAsync(bool external) API implemented

This allows developers to handle the AudioClient externally (for example with Lavalink)

* Modify ConnectAsync API and add DisconnectAsync to IAudioChannel

* Update summary message on IAudioChannel.DisconnectAsync()

* Review changes:
- Fix `if (!external)` styling
- Remove unecessary ConnectAsync overload

* SocketVoiceChannel overload update

* Update IAudioChannel.ConnectAsync()
- Remove ConfigAction from parameters
- Add SelfDeafen/SelfMute to parameters

* Remove SocketVoiceChannel.ConnectAsync() default params (Inherit)