chore: set up commitlint, husky, and prettier (#1451)

* chore: add prettier configuration

Signed-off-by: Xe Iaso <me@xeiaso.net>

* format: run prettier tree-wide

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore(prettier): ignore intentionally ungrammatical files

Signed-off-by: Xe Iaso <me@xeiaso.net>

* ci: add PR title lint rule

Signed-off-by: Xe Iaso <me@xeiaso.net>

* ci: add DCO check

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: add commitlint and husky

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: add CONTRIBUTING guidelines

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: set SKIP_INTEGRATION in precommit tests

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: update spelling

Signed-off-by: Xe Iaso <me@xeiaso.net>

* ci(dco): remove reopened trigger

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore: remove dead file

Signed-off-by: Xe Iaso <me@xeiaso.net>

* chore(prettier): don't format nginx includes

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

data/common/allow-api-like.yaml

@@ -2,5 +2,5 @@
   action: ALLOW
   expression:
     all:
-    - '!(method == "HEAD" || method == "GET")'
-    - path.startsWith("/api/")
+      - '!(method == "HEAD" || method == "GET")'
+      - path.startsWith("/api/")

data/common/json-api.yaml

@@ -4,4 +4,4 @@
     all:
       - '"Accept" in headers'
       - 'headers["Accept"] == "application/json"'
-      - 'path.startsWith("/api/")'
+      - 'path.startsWith("/api/")'

data/common/rfc-violations.yaml

@@ -1,3 +1,3 @@
 - name: no-user-agent-string
   action: DENY
-  expression: userAgent == ""
+  expression: userAgent == ""