Revise some Mixin Tags (#205)

* Remove Fabric Wiki and Mixin CheatSheet links
The Fabric Wiki is still mostly unreliable, and the CheatSheet is very outdated.

* Emphasize the cheatsheet is severely outdated
The Mixin CheatSheet has not been updated in 6 years and still contains things like using localcapture over `@Local`.

* Conform to `modid$name` convention for duck interface and accessor snippets; add wiki link to accessors tag
The Accessors Wiki page has been revised and should be reliable now.

Author: MildestToucan

tags/faq/mixin.ytag

@@ -6,9 +6,9 @@ Mixin is a trait/mixin and bytecode weaving framework for Java using ASM written
 
 Mixin Wiki: <https://github.com/SpongePowered/Mixin/wiki>
 Javadoc: <http://jenkins.liteloader.com/view/Other/job/Mixin/javadoc/index.html>
-Fabric Wiki tutorial: <https://fabricmc.net/wiki/tutorial:mixin_introduction>
-Cheatsheet: <https://github.com/2xsaiko/mixin-cheatsheet/blob/master/README.md>
+MixinExtras Wiki: <https://github.com/LlamaLad7/MixinExtras/wiki/>
 
 See also:
 `!!mcdev` - An IntelliJ plugin which adds useful helpers and inspections for using mixin
 `!!spongecord` - The Sponge Discord server, with official support for Mixin in the `#mixin` channel
+<#807617700734042122> - The Fabric Discord support channel for Mixins, with a pinned introduction message

tags/link/mixincs.ytag

@@ -2,4 +2,4 @@ type: text
 
 ---
 
-Mixin Cheatsheet: https://github.com/2xsaiko/mixin-cheatsheet/blob/master/README.md
+Mixin Cheatsheet (!! Severely Outdated !!): https://github.com/2xsaiko/mixin-cheatsheet/blob/master/README.md

tags/snippet/accessor.ytag

@@ -6,15 +6,16 @@ io/github/mymod/mixin/MyClassAccess
 ```java
 @Mixin(MyClass.class)
 public interface MyClassAccess {
-  @Invoker void callAccess();
-  @Accessor int getMyField();
+  @Invoker void modid$callAccess();
+  @Accessor int modid$getMyField();
 }
 ```
 to use it
 ```java
 public class Container {
   public void slapHaykam(MyClass instance) {
-     ((MyClassAccess)instance).callAccess();
+     ((MyClassAccess)instance).modid$callAccess();
   }
 }
 ```
+More information at <https://wiki.fabricmc.net/tutorial:mixin_accessors>

tags/snippet/🦆.ytag

@@ -10,7 +10,7 @@ io/github/mymod/mixin/MyClassMixin
 @Mixin(MyClass.class)
 public class MyClassMixin implements MyClassAccess {
     @Override
-    public void mymod$access() {
+    public void modid$access() {
         System.out.println("Accessed!");
     }
 }
@@ -21,15 +21,15 @@ io/github/mymod/access/MyClassAccess
 // The duck interface being implemented onto `MyClass`
 public interface MyClassAccess {
     // Make sure to prefix the method name with your mod id to prevent conflicts with other mods
-    void mymod$access();
+    void modid$access();
 }
 ```
 
 To use it:
 ```java
 public class Container {
     public void slapHaykam(MyClass instance) {
-        ((MyClassAccess)instance).mymod$access(); // Will print "Accessed!"
+        ((MyClassAccess)instance).modid$access(); // Will print "Accessed!"
     }
 }
 ```