Modularize website header and footer

[carlkma]

Context

• Currently, each html page contains code for its header and footer
• However, since the header and footer are consistent between pages, this code is just copied and pasted
• The redundancy is undesirable. Making one small change in the header requires modifying MANY files
  Requirements
• Explore options to modularize sections of the website
• Make a standalone header and footer file, and "import" it on every webpage
  Acceptance Criteria
• research ways to do that
• discuss with team prior to implementation