docs: add vector's CHEP proceedings (#2735)

* docs: add vector's CHEP proceedings

* rm DOI

Author: Saransh-cpp

_data/publications/vector-CHEP-2024.yml

@@ -0,0 +1,10 @@
+title: "A new SymPy backend for Vector: Uniting experimental and theoretical physicists"
+link: https://doi.org/10.1051/epjconf/202533701240
+date: 2025-10-07
+citation: |
+  A new SymPy backend for Vector: Uniting experimental and theoretical physicists
+  Saransh  Chopra, Jim  Pivarski
+  EPJ Web Conf. 337 01240 (2025)
+focus-area: as
+project:
+  - vector