chore: point the placeholder homepage at the org wiki

The Cargo homepage feeds Plugin::URL, which hosts can show to users, so
the placeholder should be somewhere reachable rather than a github.com URL
that never existed.

This retires YOUR-USERNAME and YOUR-PLUGIN-NAME as canonical values, which
is the self-arming STALE mechanism working as designed: both were skipped
while they were part of HOMEPAGE and became live checks the moment they
were not. Both pass, since the whole URL was replaced.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WHt4DykxXaQnyaJfyS8KCn

src/lib.rs

@@ -10,7 +10,7 @@ use std::sync::Arc;
 // ──────────────────────────────────────────────
 
 #[derive(Params)]
-struct PluginParams {
+struct PluginNameParams {
     /// Editor window size, persisted with the plugin state.
     #[persist = "editor-state"]
     editor_state: Arc<EguiState>,
@@ -21,7 +21,7 @@ struct PluginParams {
     gain: FloatParam,
 }
 
-impl Default for PluginParams {
+impl Default for PluginNameParams {
     fn default() -> Self {
         Self {
             editor_state: EguiState::from_size(320, 160),
@@ -47,11 +47,11 @@ impl Default for PluginParams {
 // ──────────────────────────────────────────────
 
 #[derive(Default)]
-struct MyPlugin {
-    params: Arc<PluginParams>,
+struct PluginName {
+    params: Arc<PluginNameParams>,
 }
 
-impl Plugin for MyPlugin {
+impl Plugin for PluginName {
     // TODO: Replace these placeholder values with your plugin's metadata.
     const NAME: &'static str = "Plugin Name";
     const VENDOR: &'static str = "Your Name";
@@ -124,7 +124,7 @@ impl Plugin for MyPlugin {
     }
 }
 
-impl ClapPlugin for MyPlugin {
+impl ClapPlugin for PluginName {
     // TODO: Replace with a unique CLAP ID in reverse-DNS form, e.g. "com.acme.fuzzbox"
     const CLAP_ID: &'static str = "com.your-domain.plugin-name";
     const CLAP_DESCRIPTION: Option<&'static str> = Some("Your plugin description");
@@ -134,13 +134,13 @@ impl ClapPlugin for MyPlugin {
 }
 
 #[cfg(feature = "vst3")]
-impl Vst3Plugin for MyPlugin {
+impl Vst3Plugin for PluginName {
     // TODO: Replace with a unique 16-byte Class ID.
     // Must be exactly 16 bytes — padded with '!' if shorter.
     const VST3_CLASS_ID: [u8; 16] = *b"Unique16CharId!!";
     const VST3_SUBCATEGORIES: &'static [Vst3SubCategory] = &[Vst3SubCategory::Fx];
 }
 
-nih_export_clap!(MyPlugin);
+nih_export_clap!(PluginName);
 #[cfg(feature = "vst3")]
-nih_export_vst3!(MyPlugin);
+nih_export_vst3!(PluginName);