Improve and modernize docs. (#2882)

* Add proper home landing page.

* Improve landing page considerably.

* Add navbar library name.

* Fix css rules.

* Update getting started images.

* Change favicon to the navbar's logo.

* Tiny change to docs index.

* Add title to home landing page.

* Tweak build overrides faq page.

* Fix FAQ article titles and headers.

* Fix FAQ article titles and headers.

* Replace channel 9 with the official .net course.

docs/faq/basics/basic-operations.md

@@ -1,6 +1,6 @@
 ---
 uid: FAQ.Basics.BasicOp
-title: Questions about Basic Operations
+title: Basic Operations Questions
 ---
 
 # Basic Operations Questions

docs/faq/basics/client-basics.md

@@ -1,6 +1,6 @@
 ---
 uid: FAQ.Basics.ClientBasics
-title: Basic Questions about Client
+title: Client Basics Questions
 ---
 
 # Client Basics Questions

docs/faq/basics/dependency-injection.md

@@ -1,9 +1,9 @@
 ---
 uid: FAQ.Basics.DI
-title: Questions about Dependency Injection.
+title: Questions about Dependency Injection
 ---
 
-# Dependency-injection-related Questions
+# Dependency Injection-related Questions
 
 In the following section, you will find common questions and answers
 to utilizing dependency injection with @Discord.Commands and @Discord.Interactions, as well as

docs/faq/basics/getting-started.md

@@ -1,15 +1,15 @@
 ---
 uid: FAQ.Basics.GetStarted
-title: Beginner Questions / How to Get Started
+title: Getting Started
 ---
 
-# Basic Concepts / Getting Started
+# Getting Started
 
 In this following section, you will find commonly asked questions and
 answers about how to get started with Discord.Net, as well as basic
 introduction to the Discord API ecosystem.
 
-## How do I add my bot to my server/guild?
+## How do I add my bot to my guild?
 
 Inviting your bot can be done by using the OAuth2 url generator provided by the [Discord Developer Portal].
 
@@ -86,10 +86,10 @@ it will return the user ID of the aforementioned user.
 > Right-clicking on the role and copying the ID will **not** work.
 > This will only copy the message ID.
 
-Several common ways to do this:
+There are several common ways to do this:
 
-1. (Easiest) Right click on the role either in the Server Settings
-   or in the user's role list.
+1. Right click on the role either in the Server Settings
+   or in the user's role list (recommended).  
    ![Roles](images/role-copy.png)
 2. Make the role mentionable and mention the role, and escape it
   using the `\` character in front.

docs/faq/build_overrides/what-are-they.md

@@ -1,6 +1,6 @@
 ---
 uid: FAQ.BuildOverrides.WhatAreThey
-title: Build Overrides, What are they?
+title: Build Overrides
 ---
 
 # Build Overrides

docs/faq/int_framework/general.md

@@ -1,9 +1,9 @@
 ---
 uid: FAQ.Interactions.General
-title: Interactions
+title: Interaction Basics
 ---
 
-# Interaction basics
+# Interaction Basics
 
 This chapter mostly refers to interactions in general,
 and will include questions that are common among users of the Interaction Framework

docs/faq/int_framework/manual.md

@@ -1,9 +1,9 @@
 ---
 uid: FAQ.Interactions.Manual
-title: Manual handling
+title: Manual Handling
 ---
 
-# Manually handing interactions.
+# Manually Handling Interactions
 
 This section talks about the manual building and responding to interactions.
 If you are using the interaction framework (highly recommended) this section does not apply to you.

docs/faq/int_framework/respondings-schemes.md

@@ -1,6 +1,6 @@
 ---
 uid: FAQ.Interactions.RespondingSchemes
-title: Interaction response schemes
+title: Interaction Response Schemes
 ---
 
 # Interaction Response Schemes

docs/faq/misc/legacy.md

@@ -1,6 +1,6 @@
 ---
 uid: FAQ.Legacy
-title: Questions about Legacy Versions
+title: Legacy Questions
 ---
 
 # Legacy Questions

docs/faq/toc.yml

@@ -22,7 +22,7 @@
   items: 
     - name: Text Command basics
       topicUid: FAQ.TextCommands.General
-- name: Legacy or Upgrade
+- name: Legacy Questions
   topicUid: FAQ.Legacy
 - name: Build Overrides
   topicUid: FAQ.BuildOverrides.WhatAreThey