Remove the legacy webapp (#1045)

Motivation:

The new UI becomes stablized and we don't get addtional bug reports for
them. So I think it is safe to remove the legacy webapp to improve build
speed and reduce the artifact size.

Modifications:

- Remove `server/src/main/resource` folder
- Remove build scripts for the legacy webapp in `build.gradle`
- Remove `/legacy-webapp` route path from the server.

Result:

The legacy webapp is no longer supported.

server/build.gradle

@@ -1,14 +1,3 @@
-plugins {
-    alias libs.plugins.node.gradle
-}
-
-node {
-    version = '22.3.0'
-    npmVersion = '10.8.1'
-    download = true
-    npmInstallCommand = "ci"
-}
-
 dependencies {
     implementation project(':common-legacy')
 
@@ -73,52 +62,4 @@ if (!rootProject.hasProperty('noWeb')) {
     }
 }
 
-def clientRelocations = [
-        'ace-builds/src-min-noconflict/',
-        'angular/angular.min.js',
-        'angular-cache-buster/angular-cache-buster.js',
-        'angular-cookies/angular-cookies.min.js',
-        'angular-dynamic-locale/dist/tmhDynamicLocale.min.js',
-        'angular-ui-ace/src/ui-ace.js',
-        'angular-i18n',
-        'angular-local-storage/dist/angular-local-storage.min.js',
-        'angular-resource/angular-resource.min.js',
-        'angular-sanitize/angular-sanitize.min.js',
-        'angular-translate/dist/angular-translate.min.js',
-        'angular-translate-loader-partial/angular-translate-loader-partial.min.js',
-        'angular-translate-storage-cookie/angular-translate-storage-cookie.min.js',
-        'angular-ui-ace/src/ui-ace.js',
-        'angular-ui-bootstrap/dist/',
-        'angular-ui-notification/dist/',
-        'angular-ui-router/release/angular-ui-router.min.js',
-        'bootstrap/dist/',
-        'bootswatch/cerulean/bootstrap.min.css',
-        'diff/dist/diff.min.js',
-        'fast-json-patch/dist/json-patch-duplex.min.js',
-        'jquery/dist/jquery.min.js',
-        'json3/lib/json3.min.js',
-        'moment/min/moment.min.js'
-]
-
-task copyClientDependencies {
-    dependsOn tasks.npmInstall
-
-    doLast {
-        clientRelocations.each { location ->
-            def paths = location.split('/')
-            def folder = paths[0]
-            copy {
-                from "${project.projectDir}/node_modules/$location"
-                into "${project.projectDir}/src/main/resources/webapp/vendor/$folder"
-            }
-        }
-    }
-}
-
-task cleanClientDependencies(type: Delete) {
-    delete "${project.projectDir}/src/main/resources/webapp/vendor"
-}
-
 tasks.sourcesJar.dependsOn(tasks.versionProperties)
-tasks.clean.dependsOn(tasks.cleanClientDependencies)
-tasks.processResources.dependsOn(tasks.copyClientDependencies)

server/src/main/java/com/linecorp/centraldogma/server/CentralDogma.java

@@ -900,13 +900,6 @@ protected HttpResponse doGet(ServiceRequestContext ctx, HttpRequest req) {
                                 .serveCompressedFiles(true)
                                 .fallbackFileExtensions("html")
                                 .build());
-
-            sb.serviceUnder("/legacy-web",
-                            FileService.builder(CentralDogma.class.getClassLoader(), "webapp")
-                                       .cacheControl(ServerCacheControl.REVALIDATED)
-                                       .autoDecompress(true)
-                                       .serveCompressedFiles(true)
-                                       .build());
         }
 
         sb.errorHandler(new HttpApiExceptionHandler());