Ignore Chart.lock for formatters/linters (#424)

This might hopefully help with the formatting issues around `Chart.lock`.

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/424
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Co-committed-by: pat-s <patrick.schratz@gmail.com>

.markdownlintignore

@@ -1,3 +1,4 @@
 .gitea/
 node_modules/
 charts/
+Chart.lock

.prettierignore

@@ -0,0 +1 @@
+Chart.lock

Chart.lock

@@ -1,8 +1,8 @@
 dependencies:
-  - name: memcached
+- name: memcached
   repository: oci://registry-1.docker.io/bitnamicharts
   version: 6.3.13
-  - name: postgresql
+- name: postgresql
   repository: oci://registry-1.docker.io/bitnamicharts
   version: 12.2.6
 digest: sha256:7a37054b0ae841314b1e309fec6f1edc0f22f77161ee915ebfb1ce011457884c