refactor: ♻️ revise CITATION.cff.jinja to use Jinja variables (#81)

# Description

Add Jinja variables as well as TODO items.

This PR needs a quick review.

Author: lwjohnst86

template/CITATION.cff.jinja

@@ -1,31 +1,26 @@
-title: "Template Data Package: An opinionated setup for making FAIR and structured data using Seedcase Python packages"
-abstract: "A template for making a Git repository that follows strongly opinionated practices for building and managing a data package. These practices include using Seedcase Python packages, such as Seedcase Sprout, and the Frictionless Data Package standard."
+# TODO: Add title of data package.
+title: ""
+# TODO: Add abstract of data package.
+abstract: ""
 authors:
-  - family-names: Johnston
-    given-names: Luke William
-    orcid: "https://orcid.org/0000-0003-4169-2616"
-    affiliation: "Steno Diabetes Center Aarhus"
-  - family-names: Brødbæk
-    given-names: Signe Kirk
-    affiliation: "Steno Diabetes Center Aarhus"
-  - family-names: Beicher
-    given-names: Kristiane
-    affiliation: "Steno Diabetes Center Aarhus"
-  - family-names: Vago
-    given-names: Marton
-    affiliation: "Steno Diabetes Center Aarhus"
+  - family-names: {{ author_family_name }}
+    given-names: {{ author_given_name }}
+  # TODO: Add ORCID and affiliation for the author.
+    orcid: ""
+    affiliation: ""
+  # TODO: Add more authors as needed.
+  # - family-names: ""
+  #   given-names: ""
+  #   orcid: ""
+  #   affiliation: ""
 cff-version: 1.2.0
 # doi:
 keywords:
-  - "template repository"
-  - "template project"
-  - "template data package"
-  - "data engineering"
-  - "data infrastructure"
-  - "data package"
-  - "frictionless data"
-  - "FAIR data"
-license: MIT
-message: "If you use this software, please cite it using these metadata."
-repository-code: "https://github.com/seedcase-project/template-data-package"
-url: "https://template-data-package.seedcase-project.org"
+  # TODO: Add keywords relevant to the project.
+  - ""
+# TODO: Add a data license for the data package.
+license: ""
+message: "If you use this data package, please cite it using these metadata."
+repository-code: "https://github.com/{{ package_github }}"
+# TODO: Add a URL for any website for the data package.
+# url: ""