Fix Logos for a few Agencies

[SueValente]

US International Trade Commission:

• Current Logo: https://raw.githubusercontent.com/GSA/logo/refs/heads/master/usitc.png
• New Logo: https://www.usitc.gov/themes/usitc_uswds_v2/usitc-logo.svg
  Cameron Richardson (he/him); Software Engineering Division - OCIO
  U.S. International Trade Commission

National Endowment for the Humanities

• Current Logo: https://raw.githubusercontent.com/GSA/logo/master/neh.png
• New Logo: NEH Brand Materials | National Endowment for the Humanities.
  Gaidurgis, Andrew agaidurgis@neh.gov