install symfony demo with installer

app/config/packages/dev/debug.yaml

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+debug:
+    # Forwards VarDumper Data clones to a centralized server allowing to inspect dumps on CLI or in your browser.
+    # See the "server:dump" command to start a new server.
+    dump_destination: "tcp://%env(VAR_DUMPER_SERVER)%"

app/config/packages/dev/mailer.yaml

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+framework:
+    mailer:
+        # this disables delivery of messages entirely
+        dsn: 'null://null'

app/config/packages/dev/monolog.yaml

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+monolog:
+    handlers:
+        main:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.log"
+            level: debug
+            channels: ["!event"]
+        # uncomment to get logging in your browser
+        # you may have to allow bigger header sizes in your Web server configuration
+        #firephp:
+        #    type: firephp
+        #    level: info
+        #chromephp:
+        #    type: chromephp
+        #    level: info
+        console:
+            type: console
+            process_psr_3_messages: false
+            channels: ["!event", "!doctrine", "!console"]

app/config/packages/dev/web_profiler.yaml

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+web_profiler:
+    toolbar: true
+    intercept_redirects: false
+
+framework:
+    profiler: { only_exceptions: false }