chore: optimize dependabot and PR templates in workflow (#511)

* chore: update the link to the Contributing Guide in the pull request template

* chore: remove GitHub Actions from dependabot config

* chore: change "Contributing Guide" to "Contributor Guide" for consistency

Author: delei

.github/dependabot.yml

@@ -9,7 +9,3 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "daily"
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"

.github/pull_request_template.md

@@ -22,6 +22,6 @@ Related: #ISSUE
 
 ## Checklist
 
-- [ ] I have read the [CONTRIBUTING](../CONTRIBUTING.md) guide.
+- [ ] I have read the [Contributor Guide](https://fast-excel.github.io/fastexcel/community/contribution).
 - [ ] I have written the necessary doc or comment.
 - [ ] I have added the necessary unit tests and all cases have passed.