build: expand first PR and first issue comments

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: passed
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

.github/workflows/scripts/first_time_greeting

@@ -133,7 +133,53 @@ main() {
 			# Post a comment on the PR:
 			comment=":wave: Hi there! :wave:
 
-	And thank you for opening your first pull request! We will review it shortly. :runner: :dash:"
+	And thank you for opening your first pull request! We will review it shortly. :runner: :dash:
+
+	## Getting Started
+
+	-   Please read our [contributing guidelines][stdlib-contributing] if you haven't already.
+	-   For development guidance, refer to the [development guide][stdlib-development]
+
+	## Next Steps
+
+	1.  A project maintainer will approve GitHub Actions workflows for your PR.
+	2.  All CI checks must pass before your submission can be fully reviewed.
+	3.  You'll need to address any failures in linting or unit tests.
+
+	## Running Tests Locally
+
+	You can use \`make\` to run any of the CI commands locally from the **root directory** of the stdlib repository:
+
+	\`\`\`bash
+	# Run tests for all packages in the math namespace:
+	make test TESTS_FILTER=\".*/@stdlib/math/.*\"
+
+	# Run benchmarks for a specific package:
+	make benchmark BENCHMARKS_FILTER=\".*/@stdlib/math/base/special/sin/.*\"
+	\`\`\`
+
+	If you haven't heard back from us within two weeks, please ping us by tagging the \"reviewers\" team in a comment on this PR.
+
+	If you have any further questions while waiting for a response, please join our [Gitter channel][stdlib-gitter] to chat with project maintainers and other community members.
+
+	We appreciate your contribution!
+
+	## Documentation Links
+
+	-   [Contributing Guidelines][stdlib-contributing]
+	-   [Developtment Guide][stdlib-development]
+	-   [Gitter channel][stdlib-gitter]
+	-   [make rules for running examples][make-docs-examples]
+	-   [make rules for running project unit tests][make-docs-test]
+	-   [make rules for running benchmarks][make-docs-benchmark]
+
+	[stdlib-contributing]: https://github.com/stdlib-js/stdlib/blob/develop/CONTRIBUTING.md
+	[stdlib-development]: https://github.com/stdlib-js/stdlib/blob/develop/docs/contributing/development.md
+	[stdlib-gitter]: https://gitter.im/stdlib-js/stdlib
+
+	[make-docs-examples]: https://github.com/stdlib-js/stdlib/blob/develop/tools/make/lib/examples/README.md
+	[make-docs-test]: https://github.com/stdlib-js/stdlib/blob/develop/tools/make/lib/test/README.md
+	[make-docs-benchmark]: https://github.com/stdlib-js/stdlib/blob/develop/tools/make/lib/benchmark/README.md"
 			if ! github_api "POST" "/repos/${repo_owner}/${repo_name}/issues/${issue_number}/comments" "{\"body\":$(echo "${comment}" | jq -R -s -c .)}"; then
 				echo "Failed to post comment on PR."
 				on_error 1
@@ -152,7 +198,11 @@ main() {
 			# Post a comment on the issue:
 			comment="wave: Hi there! :wave:
 
-	And thank you for opening your first issue! We will get back to you shortly. :runner: :dash:"
+	And thank you for opening your first issue! We will get back to you shortly. :runner: :dash:
+
+	If you have any further questions while waiting for a response, please join our [Gitter channel][stdlib-gitter] to chat with project maintainers and other community members.
+
+	[stdlib-gitter]: https://gitter.im/stdlib-js/stdlib"
 			if ! github_api "POST" "/repos/${repo_owner}/${repo_name}/issues/${issue_number}/comments" "{\"body\":$(echo "${comment}" | jq -R -s -c .)}"; then
 				echo "Failed to post comment on issue."
 				on_error 1