feat: add unsubscribe functionality for push notifications and update key/cert file paths

frontend/vue-app/key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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+8MwMQKqnFdwGId5HrD+zMskf66tGsTLynHJI+rGEz/k+OJMzpONycFNB7evH6Ktx
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+qiA0VRGjKCUCgYAkiWVbbzD8Pk8AIDRVo+ZYw1pFydnxQj5zmOEfOHAYfgXKNLCK
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+MXDnGKEah7jEQrUhKRVUVnWz3pjxu51GtY/HyNOUygNAZRC204yD0GPaIQKBgAuZ
+pwKSLfyaRJBxxJvCCxDSqdy+RYVPfHRbhsemz80EUhIk9H0qnd6coP3LiIYDaE9m
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+T8bTKVfhAtNLbF0AtXGiwcWj7fu4ARAcIp1HIunNJHJ8nBwX3b2dSVk+1r1cEtZ1
+ci37D+2dsKZpVB10J4bXPeeCOZxAwFXXe1Prl1ectR6E3V9uT+8Xwuoc4cbHtHLG
+CursqqBnIAFhvhxjj85QGv4=
+-----END PRIVATE KEY-----