pulumi-config: add page (#14820)

* pulumi-config: add page

* Apply suggestions from code review

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
config.md

---

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>
Co-authored-by: Nelson Figueroa <30811275+nelsonfigueroa@users.noreply.github.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/pulumi-config.md

@@ -0,0 +1,28 @@
+# pulumi config
+
+> Manage configuration of a Pulumi stack.
+> More information: <https://www.pulumi.com/docs/iac/cli/commands/pulumi_config/>.
+
+- View current configuration in JSON format:
+
+`pulumi config --json`
+
+- Get the value of a configuration key:
+
+`pulumi config get {{key}}`
+
+- Remove a configuration value:
+
+`pulumi config rm {{key}}`
+
+- Set a value for a configuration key from a file:
+
+`cat {{path/to/file}} | pulumi config set {{key}}`
+
+- Set a secret value (e.g. API key) for a configuration key and store/display as ciphertext:
+
+`pulumi config set --secret {{key}} {{S3cr37_value}}`
+
+- Remove multiple configuration values from a specified configuration file:
+
+`pulumi config --config-file {{path/to/file}} rm-all {{key1 key2 ...}}`