SEO Update for Main Page

[hoangvu5]

Documentation:
https://developers.google.com/search/docs/appearance/structured-data/event
https://schema.org/Event

Adding JSON-LD structured data for events allows Google to better understand and index the programming contest event information in a standardized, machine-readable format. The contest information can be eligible to be displayed in the Event section on Google. Inside src/core/templates/core/index.html in {% block head %}, add this:

<!-- Event Structured Data -->
{% if contest %}
<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Event",
  "name": "ACM at FSU Programming Contest",
  "description": "An ICPC-style programming contest hosted semesterly by the Florida State University Association for Computing Machinery Student Chapter. Teams of up to 3 members compete to solve coding challenges.",
  {% if contest.contest_date and contest.contest_start %}
  "startDate": "{{ contest.contest_date|date:'Y-m-d' }}T{{ contest.contest_start|time:'H:i:s' }}{{ contest.contest_date|date:'O' }}",
  {% endif %}
  {% if contest.contest_date and contest.contest_end %}
  "endDate": "{{ contest.contest_date|date:'Y-m-d' }}T{{ contest.contest_end|time:'H:i:s' }}{{ contest.contest_date|date:'O' }}",
  {% endif %}
  "eventStatus": "https://schema.org/EventScheduled",
  "eventAttendanceMode": "{% if contest.participation == 2 %}https://schema.org/OnlineEventAttendanceMode{% elif contest.participation == 3 %}https://schema.org/MixedEventAttendanceMode{% else %}https://schema.org/OfflineEventAttendanceMode{% endif %}",
  "location": {
    "@type": "Place",
    "name": "James J. Love Building",
    "address": {
      "@type": "PostalAddress",
      "streetAddress": "1017 Academic Way",
      "addressLocality": "Tallahassee",
      "addressRegion": "FL",
      "postalCode": "32304",
      "addressCountry": "US"
    }
  },
  "organizer": {
    "@type": "Organization",
    "name": "ACM at Florida State University",
    "url": "https://fsu.acm.org"
  },
  "image": "{{ request.scheme }}://{{ request.get_host }}{% static 'img/acm_fsu_diamond.png' %}",
  "url": "{{ request.scheme }}://{{ request.get_host }}{% url 'index' %}"
}
</script>
{% endif %}

The above code should be checked again for correctness.