Issue #3372098: Add search form in docs and blog pages

config/install/block.block.searchform.yml

+langcode: en
+status: true
+dependencies:
+  module:
+    - node
+    - search
+    - system
+  theme:
+    - webtheme
+id: searchform
+theme: webtheme
+region: breadcrumb
+weight: 0
+provider: null
+plugin: search_form_block
+settings:
+  id: search_form_block
+  label: 'Search form'
+  label_display: '0'
+  provider: search
+  page_id: ''
+visibility:
+  request_path:
+    id: request_path
+    negate: false
+    pages: "/docs\r\n/blog\r\n/docs/*\r\n/blog/*"
+  'entity_bundle:node':
+    id: 'entity_bundle:node'
+    negate: false
+    context_mapping:
+      node: '@node.node_route_context:node'
+    bundles:
+      webblog: webblog
+      webdoc: webdoc