OGP向けにインスタンスのバナー画像を提供するように

package.json

@@ -37,7 +37,6 @@
 		"@types/elasticsearch": "5.0.29",
 		"@types/file-type": "5.2.2",
 		"@types/gulp": "3.8.36",
-		"@types/gulp-htmlmin": "1.3.32",
 		"@types/gulp-mocha": "0.0.32",
 		"@types/gulp-rename": "0.0.33",
 		"@types/gulp-replace": "0.0.31",
@@ -120,10 +119,8 @@
 		"fuckadblock": "3.2.1",
 		"gulp": "3.9.1",
 		"gulp-cssnano": "2.1.3",
-		"gulp-htmlmin": "5.0.1",
 		"gulp-imagemin": "4.1.0",
 		"gulp-mocha": "6.0.0",
-		"gulp-pug": "4.0.1",
 		"gulp-rename": "1.4.0",
 		"gulp-replace": "1.0.0",
 		"gulp-sourcemaps": "2.6.4",