Design index.html page

[micheledallatorre]

ToDo:

• add viewport definition <meta name="viewport" content="width=device-width, initial-scale=1.0">
• add favicon?
• add charset utf-8 so that Unicode characters get recognized
• responsively show restaurant cards (using flex)

[micheledallatorre]

Breakpoints (see #4) for this page:

• <400px Layout
  • set nav bar to min-height
  • center h1
  • fix filtering buttons layout: no overlapping
  • decrease the font-size of the restaurant name
  • decrease font-size for restaurant address and make it italic
  • make images smaller
  • fit restaurant list item into the layout (do not overlap)
• 400px+ Layout
  • display Filter Results h2 and select buttons on the same line