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/apps/allow-api-routes.yaml

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

data/apps/gitea-rss-feeds.yaml

@@ -4,4 +4,4 @@
   path_regex: ^/[.A-Za-z0-9_-]{1,256}?[./A-Za-z0-9_-]*\.atom$
 - name: gitea-feed-rss
   action: ALLOW
-  path_regex: ^/[.A-Za-z0-9_-]{1,256}?[./A-Za-z0-9_-]*\.rss$
+  path_regex: ^/[.A-Za-z0-9_-]{1,256}?[./A-Za-z0-9_-]*\.rss$

data/apps/qualys-ssl-labs.yml

@@ -3,6 +3,6 @@
 - name: qualys-ssl-labs
   action: ALLOW
   remote_addresses:
-  - 69.67.183.0/24
-  - 2600:C02:1020:4202::/64
-  - 2602:fdaa:c6:2::/64
+    - 69.67.183.0/24
+    - 2600:C02:1020:4202::/64
+    - 2602:fdaa:c6:2::/64

data/apps/searx-checker.yml

@@ -5,5 +5,5 @@
 - name: searx-checker
   action: ALLOW
   remote_addresses:
-  - 167.235.158.251/32
-  - 2a01:4f8:1c1c:8fc2::1/128
+    - 167.235.158.251/32
+    - 2a01:4f8:1c1c:8fc2::1/128