Add GitHub issue templates

[WestonVoglesonger]

Summary

• Adds form-style GitHub issue templates for bug reports and feature requests under .github/ISSUE_TEMPLATE/.
• Includes config.yml with blank_issues_enabled: true so contributors can still open a blank issue when neither form fits.
• Direct port of imuGAP PR #37, with wording adapted to reference hestia.

Files

• .github/ISSUE_TEMPLATE/bug_report.yml — description, repro, sessionInfo(), OS dropdown (labels: bug).
• .github/ISSUE_TEMPLATE/feature_request.yml — use case, proposed solution, alternatives (labels: enhancement).
• .github/ISSUE_TEMPLATE/config.yml — enables blank issues.

Notes

• Labels bug and enhancement already exist on this repo.
• Draft because PR Bootstrap CI workflows and update DESCRIPTION #23 is in flight; this can queue behind it.

Closes #30
Refs #22

Test plan

• Verify GitHub renders the two forms on the "New issue" page.
• Confirm submitted issues get the expected bug / enhancement label automatically.
• Confirm the "Open a blank issue" link still appears under the form chooser.