Restructure template, add configurable description, remove comments

- Remove LoadPriority override from EntryPoint.cs (defaults to Medium)
- Add Description property (was already templated as a literal, now a
  configurable PluginDescription symbol like PluginAuthor)
- Move the buildable project into content/ so CLAUDE.md, .editorconfig,
  and .gitignore never ship in a generated plugin, and the project no
  longer shares its root with them
- Remove the SkipGit symbol and its manual-instructions postAction:
  automatic git init on generation was re-verified impossible (no
  --allow-scripts equivalent on dotnet 10 SDK to bypass the Run Script
  postAction's interactive Y/N gate); VS's own New Project checkbox
  already covers this
- Add content/CLAUDE.md so every generated plugin ships with LabAPI/
  toolchain/code-style context for Claude Code, since no C#/.NET/LabAPI
  Skill exists in the catalog
- Set PluginAuthor/PluginDescription defaultValue to generic "Your
  Name"/"Your Description" placeholders instead of "YourName"/a TODO
  string
- Strip all comments from the .csproj (project code style forbids them)

Verified by generating a project from the reinstalled template and
running dotnet build (0 warnings, 0 errors) after each change.

content/EntryPoint.cs

@@ -0,0 +1,27 @@
+using System;
+using LabApi.Features.Console;
+using LabApi.Loader.Features.Plugins;
+
+namespace LabApiPluginTemplate
+{
+    public class EntryPoint : Plugin<Config>
+    {
+        public override string Name => "LabApiPluginTemplate";
+
+        public override string Description => "TODO: describe what this plugin does.";
+
+        public override string Author => "YourName";
+
+        public override Version RequiredApiVersion { get; } = new Version("1.1.7");
+
+        public override void Enable()
+        {
+            Logger.Info($"{Name} has been enabled.");
+        }
+
+        public override void Disable()
+        {
+            Logger.Info($"{Name} has been disabled.");
+        }
+    }
+}