Fix manifest codeowners (#22871)

* Added individual files section
* Replaced some manifest/codeowners

CODEOWNERS

@@ -45,13 +45,13 @@ homeassistant/components/configurator/* @home-assistant/core
 homeassistant/components/conversation/* @home-assistant/core
 homeassistant/components/coolmaster/* @OnFreund
 homeassistant/components/counter/* @fabaff
-homeassistant/components/cover/* @cdce8p
+homeassistant/components/cover/* @home-assistant/core
 homeassistant/components/cpuspeed/* @fabaff
 homeassistant/components/cups/* @fabaff
 homeassistant/components/daikin/* @fredrike @rofrantz
 homeassistant/components/darksky/* @fabaff
 homeassistant/components/deconz/* @kane610
-homeassistant/components/demo/* @fabaff
+homeassistant/components/demo/* @home-assistant/core
 homeassistant/components/digital_ocean/* @fabaff
 homeassistant/components/discogs/* @thibmaek
 homeassistant/components/doorbird/* @oblogic7
@@ -243,3 +243,7 @@ homeassistant/components/zha/* @dmulcahey @adminiuga
 homeassistant/components/zone/* @home-assistant/core
 homeassistant/components/zoneminder/* @rohankapoorcom
 homeassistant/components/zwave/* @home-assistant/z-wave
+
+# Individual files
+homeassistant/components/group/cover @cdce8p
+homeassistant/components/demo/weather @fabaff

homeassistant/components/cover/manifest.json

@@ -7,6 +7,6 @@
     "group"
   ],
   "codeowners": [
-    "@cdce8p"
+    "@home-assistant/core"
   ]
 }

homeassistant/components/demo/manifest.json

@@ -9,6 +9,6 @@
     "zone"
   ],
   "codeowners": [
-    "@fabaff"
+    "@home-assistant/core"
   ]
 }

script/manifest/codeowners.py

@@ -27,6 +27,12 @@ homeassistant/scripts/check_config.py @kellerza
 # Integrations
 """
 
+INDIVIDUAL_FILES = """
+# Individual files
+homeassistant/components/group/cover @cdce8p
+homeassistant/components/demo/weather @fabaff
+"""
+
 
 def generate():
     """Generate CODEOWNERS."""
@@ -39,6 +45,8 @@ def generate():
         parts.append("homeassistant/components/{}/* {}".format(
             manifest['domain'], ' '.join(manifest['codeowners'])))
 
+    parts.append('\n' + INDIVIDUAL_FILES.strip())
+
     return '\n'.join(parts)