Fluid inputs: TextInput docs

[aagonzales]

Fluid inputs: Add TextInput website docs

Prerequisite

• Update text input to use new content template before integrating fluid inputs.
  • Docs: Update text input usage #3115

Tasks

• Create website branch to house all fluid input updates (do not merge)
• Update "style" tab to include Fluid variant
• Update "usage" tab to include Fluid variant
• Create fluid input pattern with initial Fluid TextInput Fluid input form pattern shall be addressed in a separate issue.