re-write services section

[ylegrand-ignitioncomputing]

rewriting service pages to make them more specific to ignition computing projects and experiences:

• full stack development:
  • mention software and frameworks we use
  • reference Projoules
• Research Software
  • list some codes that we have worked with
  • list research software projects
• Verification & Validation
  • more engineering specific intro
• Visualisation
  • use own visualizations
  • less fluffy intro
• Fusion (own section)