Memberpage created, and linked from the top of the landing page

[larsvilhuber]

Needs everybody to fill in their info.

[Copilot]

Pull request overview

Adds a members listing to the SSDE Jekyll site and links it from the top navigation, with CI updated to build on pull requests.

Changes:

• Added a new members.md page that renders a members table from _data/members.csv.
• Updated the “Who We Are” landing-page section to link to the members page, and added a “Members” item to site navigation.
• Updated the GitHub Pages workflow to run on pull_request (build-only) and adjusted deploy behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
members.md	New members page with a Liquid-generated table from site.data.members.
.github/workflows/jekyll-gh-pages.yml	Runs build on PRs and prevents deploy on PR events.
.github/skills/jekyll-ssde-site/SKILL.md	Adds repository-specific documentation about the site’s structure/content model.
_posts/2023-01-01-who-we-are.markdown	Updates landing-page “Who We Are” section to reference the members page.
_data/members.csv	Introduces initial members dataset to power the members table.
_config.yml	Adds “Members” to navigation and updates site metadata fields.

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