Remove deprecated Nginx configuration for stream.graff.estate and update package dependencies in session-server and client

- Deleted the Nginx configuration file for stream.graff.estate.
- Updated bun.lock files in both client and session-server to include new dependencies and version updates.
- Added 'tree-kill' dependency to session-server for improved process management.
- Refactored process termination logic in session-server to utilize 'tree-kill' for reliable process termination.

session-server/bun.lock

@@ -1,10 +1,12 @@
 {
   "lockfileVersion": 1,
+  "configVersion": 0,
   "workspaces": {
     "": {
       "name": "strem.graff.tech-session-server",
       "dependencies": {
         "got": "^14.4.9",
+        "tree-kill": "^1.2.2",
       },
       "devDependencies": {
         "bun-types": "latest",
@@ -66,6 +68,8 @@
 
     "responselike": ["responselike@3.0.0", "", { "dependencies": { "lowercase-keys": "^3.0.0" } }, "sha512-40yHxbNcl2+rzXvZuVkrYohathsSJlMTXKryG5y8uciHv1+xDLHQpgjG64JUO9nrEq2jGLH6IZ8BcZyw3wrweg=="],
 
+    "tree-kill": ["tree-kill@1.2.2", "", { "bin": { "tree-kill": "cli.js" } }, "sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A=="],
+
     "type-fest": ["type-fest@4.41.0", "", {}, "sha512-TeTSQ6H5YHvpqVwBRcnLDCBnDOHWYu7IvGbHT6N8AOymcr9PJGjc1GTtiWZTYg0NCgYwvnYWEkVChQAr9bjfwA=="],
 
     "undici-types": ["undici-types@7.14.0", "", {}, "sha512-QQiYxHuyZ9gQUIrmPo3IA+hUl4KYk8uSA7cHrcKd/l3p1OTpZcM0Tbp9x7FAtXdAYhlasd60ncPpgu6ihG6TOA=="],