Improve CITATION.cff file (#4201)

CITATION.cff

@@ -1,6 +1,3 @@
-# This CITATION.cff file was generated with cffinit.
-# Visit https://bit.ly/cffinit to generate yours today!
-
 cff-version: 1.2.0
 title: Typst
 message: >-
@@ -15,11 +12,28 @@ authors:
     family-names: Haug
     email: martin.haug@typst.app
   - name: The Typst Project Developers
-identifiers:
-  - type: url
-    value: >-
-      https://laurmaedje.github.io/programmable-markup-language-for-typesetting.pdf
-    description: "Typst: A Programmable Markup Language for Typesetting"
+references:
+  - title: A Programmable Markup Language for Typesetting
+    authors:
+    - family-names: Mädje
+      given-names: Laurenz
+    year: 2022
+    type: thesis
+    thesis-type: Master's thesis
+    url: https://laurmaedje.github.io/programmable-markup-language-for-typesetting.pdf
+    institution:
+      name: Technische Universität Berlin
+  - title: Fast typesetting with incremental compilation
+    authors:
+    - family-names: Haug
+      given-names: Martin
+    year: 2022
+    type: thesis
+    thesis-type: Master's thesis
+    doi: 10.13140/RG.2.2.15606.88642
+    url: https://doi.org/10.13140/RG.2.2.15606.88642
+    institution:
+      name: Technische Universität Berlin
 repository-code: 'https://github.com/typst/typst'
 url: 'https://typst.app/'
 keywords: