brand: update some contact mails

SECURITY.md

@@ -14,4 +14,4 @@ Only two latest versions are officially supported, but older versions get some h
 
 Normally Gradience can't have security issues, but if you have found a vulnerability, please don't submit a public issue.
 
-Instead, report this vulnerability to [AdwCustomizerTeam@proton.me](mailto:AdwCustomizerTeam@proton.me) and include as much details as possible.
+Instead, report this vulnerability to [ng.eric@ik.me](mailto:ng.eric@ik.me) and include as much details as possible.

data/com.github.hydroxycarbamide.Gradience.appdata.xml.in.in

@@ -3,11 +3,11 @@
   <id>@APP_ID@</id>
   <name>Gradience</name>
   <summary>Change the look of Adwaita, with ease</summary>
-  <developer_name>Gradience Team</developer_name>
+  <developer_name>Hydroxycarbamide</developer_name>
   <launchable type="desktop-id">@[email protected]</launchable>
   <metadata_license>CC-BY-SA-4.0</metadata_license>
   <project_license>GPL-3.0-or-later</project_license>
-  <update_contact>[email protected]</update_contact>
+  <update_contact>[email protected]</update_contact>
   <content_rating type="oars-1.1"/>
 
   <description>