FAQ rework, replacing outdated info, better interaction FAQ (#2106)

* FAQ rework, replacing outdated info, better interaction faq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/int_framework/samples/interactionsyncing.cs

@@ -0,0 +1,6 @@
+DiscordSocketConfig config = new()
+{
+    UseInteractionSnowflakeDate = false
+};
+
+DiscordSocketclient client = new(config);

docs/faq/int_framework/samples/propertyinjection.cs

@@ -0,0 +1,8 @@
+public class MyModule
+{
+    // Intended.
+    public InteractionService Service { get; set; }
+
+    // Will not work. A private setter cannot be accessed by the serviceprovider.
+    private InteractionService Service { get; private set; }
+}

docs/faq/int_framework/samples/registerint.cs

@@ -0,0 +1,21 @@
+private async Task ReadyAsync()
+{
+    // pull your commands from some array, everyone has a different approach for this.
+    var commands = _builders.ToArray();
+
+    // write your list of commands globally in one go.
+    await _client.Rest.BulkOverwriteGlobalCommands(commands);
+
+    // write your array of commands to one guild in one go.
+    // You can do a foreach (... in _client.Guilds) approach to write to all guilds.
+    await _client.Rest.BulkOverwriteGuildCommands(commands, /* some guild ID */);
+
+    foreach (var c in commands)
+    {
+        // Create a global command, repeating usage for multiple commands.
+        await _client.Rest.CreateGlobalCommand(c);
+
+        // Create a guild command, repeating usage for multiple commands.
+        await _client.Rest.CreateGuildCommand(c, guildId);
+    }
+}