Revamped time logic for the backend to comply with industry standards and fix time related errors

[TairanJ]

This pull request includes several changes to improve timezone handling, streamline file path operations, and enhance the overall functionality of the access_amherst_backend project. The most important changes include the conversion of datetime objects to UTC, the use of dateutil.parser for parsing dates, and the simplification of file path operations.

Timezone Handling Improvements:

• access_amherst_backend/access_amherst_algo/generate_map.py: Added conversion of user-specified hours to UTC for database queries in generate_heatmap function.
• access_amherst_backend/access_amherst_algo/management/commands/remove_old_events.py: Converted threshold time to UTC in handle function.
• access_amherst_backend/access_amherst_algo/parse_database.py: Created datetime objects in UTC and converted them to the specified timezone in get_events_by_hour function.
• access_amherst_backend/access_amherst_algo/views.py: Activated EST timezone and converted start and end dates to UTC for database queries in home and calendar_view functions. [1] [2]

File Path Operations Simplification:

• access_amherst_backend/access_amherst_algo/email_scraper/email_parser.py: Simplified file path operations in save_to_json_file function.
• access_amherst_backend/access_amherst_algo/rss_scraper/clean_hub_data.py: Simplified file path operations in clean_hub_data function.
• access_amherst_backend/access_amherst_algo/rss_scraper/parse_rss.py: Simplified file path operations in save_json function.

Date Parsing Enhancements:

• access_amherst_backend/access_amherst_algo/rss_scraper/parse_rss.py: Replaced manual date parsing with dateutil.parser in save_event_to_db and is_similar_event functions. [1] [2]
• access_amherst_backend/access_amherst_algo/views.py: Used dateutil.parser for parsing user-provided dates in home function.

Template and Settings Updates:

• access_amherst_backend/access_amherst_algo/templates/access_amherst_algo/home.html: Added timezone localization to event dates and Google Calendar links.
• access_amherst_backend/access_amherst_backend/settings.py: Enabled django.template.context_processors.tz and allowed localhost in ALLOWED_HOSTS. [1] [2]

Test Adjustments:

• access_amherst_backend/access_amherst_tests/test_clean_hub_data.py: Updated test to match the simplified file path operations.
• access_amherst_backend/access_amherst_tests/test_email_parser.py: Updated test to match the simplified file path operations.