docs(cv): add new LaTeX CV templates and supporting source files

documents/sources/experience/leidos.yml

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+title: Mobile App Developer
+company: Leidos
+start: 2020-08-01
+end: 2021-05-01
+location: Herndon, VA, USA
+description: |
+  - Engineered and deployed features for the official Customs and Border Protection (CBP) Mobile Passport application, a high-visibility tool utilized by millions of travelers to expedite entry into the United States.
+  - Leveraged the Flutter framework and Dart to build and maintain a seamless, high-performance cross-platform experience for both iOS and Android users.
+  - Collaborated within a highly regulated, hybrid agile environment to ensure the application met strict federal security, privacy, and accessibility standards.
+skills:
+  - Flutter
+  - Dart
+  - Cross-Platform Development
+  - Mobile App Development
+  - Agile Methodologies
+  - Mobile Security