misc: Remove the handbook from the main repository

sorry guys, i just wanted to do something cool...

build.gradle

@@ -1,4 +1,3 @@
-import org.apache.tools.ant.taskdefs.condition.Os
 import org.gradle.plugins.ide.eclipse.model.SourceFolder
 
 /*
@@ -311,7 +310,6 @@ javadoc {
     // Add this to avoid warning caused by lack of comments in proto generated java files
     options.addStringOption('Xdoclint:none', '-quiet')
     exclude '**/*.md'
-    exclude 'src/handbook/**/*.*'
     exclude 'src/generated/**/*.*'
 }
 
@@ -332,81 +330,6 @@ public final class BuildConfig {
 }"""
 }
 
-tasks.register('generateHandbook') {
-    if (project.hasProperty('skipHandbook')) {
-        println('Skipping handbook generation.')
-        return
-    }
-
-    // Resolve the NPM command.
-    var npm = 'npm'
-    if (Os.isFamily(Os.FAMILY_WINDOWS))
-        npm = 'npm.cmd'
-
-    def npmVersion = {
-        try {
-            return "${npm} --version".execute()
-        } catch (ignored) {
-            ignored.printStackTrace()
-            return 'NPM_NOT_FOUND'
-        }
-    }
-
-    // Check if Node is installed.
-    if (npmVersion() == 'NPM_NOT_FOUND') {
-        println('NPM is not installed. Skipping handbook generation.')
-    } else {
-        // Check if the handbook resources are present.
-        if (!file('src/handbook/data/commands.json').exists()) {
-            println('Command data was not found. Skipping handbook generation.')
-            return
-        }
-        if (!file('src/handbook/data/avatars.csv').exists()) {
-            println('Avatar data was not found. Skipping handbook generation.')
-            return
-        }
-        if (!file('src/handbook/data/entities.csv').exists()) {
-            println('Entity data was not found. Skipping handbook generation.')
-            return
-        }
-        if (!file('src/handbook/data/items.csv').exists()) {
-            println('Item data was not found. Skipping handbook generation.')
-            return
-        }
-        if (!file('src/handbook/data/mainquests.csv').exists()) {
-            println('Main quest data was not found. Skipping handbook generation.')
-            return
-        }
-        if (!file('src/handbook/data/quests.csv').exists()) {
-            println('Quest data was not found. Skipping handbook generation.')
-            return
-        }
-        if (!file('src/handbook/data/scenes.csv').exists()) {
-            println('Scene data was not found. Skipping handbook generation.')
-            return
-        }
-
-        // Install dependencies before building.
-        exec {
-            workingDir 'src/handbook'
-            commandLine npm, 'install'
-        }
-
-        // Build the handbook.
-        exec {
-            workingDir 'src/handbook'
-            commandLine npm, 'run', 'build'
-        }
-
-        // Copy the handbook from /dist to /src/main/resources.
-        copy {
-            from 'src/handbook/dist/index.html'
-            into 'src/main/resources/html'
-            rename 'index.html', 'handbook.html'
-        }
-    }
-}
-
 processResources {
     dependsOn 'generateProto'
 }