FAQ rework, replacing outdated info, better interaction FAQ (#2106)

* FAQ rework, replacing outdated info, better interaction faq

* Update docs/faq/basics/getting-started.md

Co-authored-by: Jared L <48422312+lhjt@users.noreply.github.com>

* Update docs/faq/basics/getting-started.md

Co-authored-by: Jared L <48422312+lhjt@users.noreply.github.com>

* Update docs/faq/int_framework/general.md

Co-authored-by: Jared L <48422312+lhjt@users.noreply.github.com>

* fix TOC reference

Co-authored-by: Jared L <48422312+lhjt@users.noreply.github.com>
Co-authored-by: Quin Lynch <lynchquin@gmail.com>

docs/faq/basics/samples/missing-dep.cs

@@ -0,0 +1,32 @@
+public class MyModule : ModuleBase<SocketCommandContext>
+{
+    private readonly DatabaseService _dbService;
+    public MyModule(DatabaseService dbService)
+        => _dbService = dbService;
+}
+public class CommandHandler
+{
+    private readonly CommandService _commands;
+    private readonly IServiceProvider _services;
+    public CommandHandler(DiscordSocketClient client)
+    {
+        _services = new ServiceCollection()
+            .AddSingleton<CommandService>()
+            .AddSingleton(client)
+            // We are missing DatabaseService!
+            .BuildServiceProvider();
+    }
+    public async Task RegisterCommandsAsync()
+    {
+        // ...
+        // The method fails here because DatabaseService is a required
+        // dependency and cannot be resolved by the dependency
+        // injection service at runtime since the service is not
+        // registered in this instance of _services.
+        await _commands.AddModulesAsync(Assembly.GetEntryAssembly(), _services);
+        // ...
+
+        // The same approach applies to the interaction service.
+        // Make sure to resolve these issues!
+    }
+}