remove pdf and deprecated settings (#3897)

Author: mairaw

.openpublishing.publish.config.json

@@ -50,7 +50,6 @@
     }
   ],
   "notification_subscribers": [],
-  "branches_to_filter": [],
   "git_repository_branch_open_to_public_contributors": "master",
   "skip_source_output_uploading": false,
   "need_preview_pull_request": true,
@@ -63,12 +62,6 @@
       "branch": "master",
       "branch_mapping": {}
     },
-    {
-      "path_to_root": "_themes.pdf",
-      "url": "https://github.com/Microsoft/templates.docs.msft.pdf",
-      "branch": "master",
-      "branch_mapping": {}
-    },
     {
       "path_to_root": "samples",
       "url": "https://github.com/dotnet/samples",
@@ -80,25 +73,17 @@
   ],
   "branch_target_mapping": {
     "live": [
-      "Publish",
-      "Pdf"
+      "Publish"
     ],
     "master": [
-      "Publish",
-      "Pdf"
+      "Publish"
     ],
     "intellisense": [
       "Intellisense"
     ]
   },
-  "need_generate_pdf_url_template": true,
-  "targets": {
-    "Pdf": {
-      "template_folder": "_themes.pdf"
-    }
-  },
-  "need_generate_pdf": false,
-  "need_generate_intellisense": false,
+  "need_generate_pdf_url_template": false,
+  "targets": {},
   "dependent_packages": [
     {
       "id": "Microsoft.DocAsCode.ECMA2Yaml",