Add .dockerignore and update Fly.io configuration

- Created `.dockerignore` to exclude irrelevant files during Docker image build.
- Enhanced `fly.toml` with additional configuration such as VM specs and adjusted syntax.
- Fixed logo path in `index.html` and relocated the logo file for proper referencing.

fly.toml

@@ -1,23 +1,33 @@
-app = "gallus-pub"
-primary_region = "fra"
+# fly.toml app configuration file generated for gallus-pub on 2025-07-15T21:18:19+02:00
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
+
+app = 'gallus-pub'
+primary_region = 'fra'
+
+[experimental]
+  auto_rollback = true
 
 [build]
-dockerfile = "Dockerfile"  # Da du mit einem Dockerfile arbeitest
+  dockerfile = 'Dockerfile'
 
 [http_service]
   internal_port = 80
   force_https = true
-  auto_stop_machines = true
+  auto_stop_machines = 'stop'
   auto_start_machines = true
   min_machines_running = 0
-  processes = ["app"]
+  processes = ['app']
 
   [[http_service.checks]]
-    interval = "10s"
-    timeout = "2s"
-    grace_period = "5s"
-    method = "GET"
-    path = "/"
+    interval = '10s'
+    timeout = '2s'
+    grace_period = '5s'
+    method = 'GET'
+    path = '/'
 
-[experimental]
-  auto_rollback = true
+[[vm]]
+  memory = '1gb'
+  cpu_kind = 'shared'
+  cpus = 1