feat: update CCDB layout and add project personnel section

[lucasmarchd01]

Resolves #1928

[Copilot]

Pull request overview

Updates the Canadian Chant Database (CCD) landing page layout to accommodate a new Personnel section and adjusts the grid styling accordingly.

Changes:

• Removed an explicit grid-template-rows definition from the CCD landing grid styling.
• Repositioned the DACT initiative blurb/logo within the left (image) column.
• Added a “Personnel” section to the CCD landing page content.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
django/cantusdb_project/static/css/ccdb_style.css	Simplifies CCD landing grid row sizing by removing fixed row tracks.
django/cantusdb_project/main_app/templates/source_lists/canadian_chant_db.html	Adds Personnel section and rearranges DACT initiative content on the CCD landing page.

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