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/meta/README.md

@@ -2,4 +2,4 @@
 
 Contains policies that exclusively reference policies in _multiple_ other data folders.
 
-Akin to "stances" that the administrator can take, with reference to various topics, such as AI/LLM systems.
+Akin to "stances" that the administrator can take, with reference to various topics, such as AI/LLM systems.

data/meta/ai-block-aggressive.yaml

@@ -3,4 +3,4 @@
 - import: (data)/bots/ai-catchall.yaml
 - import: (data)/clients/ai.yaml
 - import: (data)/crawlers/ai-search.yaml
-- import: (data)/crawlers/ai-training.yaml
+- import: (data)/crawlers/ai-training.yaml

data/meta/messengers-preview.yaml

@@ -1,2 +1,2 @@
-- import: (data)/clients/telegram-preview.yaml
-- import: (data)/clients/vk-preview.yaml
+- import: (data)/clients/telegram-preview.yaml
+- import: (data)/clients/vk-preview.yaml