Fix missing whitespace below section subtitles

[vtwigt]

This pull request updates the custom Jekyll theme to v1.1.3, which contains a CSS addition that fixes missing whitespace below section subtitles, for example:

Merging this pull request should automatically build the website using the latest custom Jekyll theme version.

[github-actions]

CFF Author Updater

Pull Request Status: Invalid (with Errors)

Contributors & Contributions in Pull Request:

@vtwigt (Missing author from CITATION.cff)

• Commit Contribution
  • fa38e0d

Note: Contributors marked "(Skip for recommended or required authorship)" were manually skipped for new authorship consideration. If they were already present in the CITATION.cff file, or if a user manually adds them to the CITATION.cff file as part of this pull request, their author entry will remain. The skip command only prevents the GitHub Action from recommending or requiring authorship.

Recommended CITATION.cff file (updated with missing authors):

cff-version: 1.2.0
title: SS-NES landing page
message: GitHub page for ss-nes.github.io
type: software
authors:
- given-names: Carlos
  family-names: Martinez-Ortiz
  orcid: https://orcid.org/0000-0001-5565-7577
  email: c.martinez@esciencecenter.nl
  affiliation: Netherlands eScience Center
- name: Vincent
  alias: https://github.com/vtwigt
repository-code: https://github.com/SS-NES/ss-nes.github.io
url: https://ss-nes.github.io/
abstract: 'This repository hosts a Jekyll-based website using a custom theme for the"Best
  Practices for Sustainable Software in Natural Science and Engineering" project.


  '
keywords:
- Sustainable Software
- Natural Science and Engineering
- TDCC-NES

Important: This recommended CITATION.cff file has not been changed yet on this pull request. It can be manually copied and committed to the repository. For GitHub users to be recognized, you must use their GitHub user profile URL as their alias in the CITATION.cff file. If the CITATION.cff file is missing any contributor qualified for authorship from the pull request, the pull request will remain invalid. You may manually skip or unskip specific contributors for authorship by posting special pull request comments.

🚨 Errors:

• ERROR: Pull request is invalidated because 1 author(s) are missing from the CITATION.cff file.
• ERROR: Missing author: @vtwigt (GitHub) — unmatched CFF author — possible cause: existing CITATION.cff entry is missing an 'alias' with this GitHub profile URL: https://github.com/vtwigt

ℹ️ Info:

• INFO: No linked ORCID badge on GitHub profile page for @vtwigt
• INFO: @vtwigt: No ORCID found.
• INFO: @vtwigt: Only one name part found for Vincent, treated as entity for deduplication consistency.- @vtwigt: Commit: fa38e0d
• INFO: The recommended CITATION.cff file has been updated with 1 new author(s).

Last updated: 2025-08-08 12:06 UTC · Commit 0660169

Powered by CFF Author Updater v2.3.0

[vtwigt]

@c-martinez see above error message. Since I'm not responsible for any content, I don't think I have to be added to CITATION.cff, right?

If not, could you please perform skip-authorship-by-github-username vtwigt (as mentioned in the README) and merged this pull request?