More refinements

• add Nearby Cities, Previous Significant Earthquakes Features to Summary
• add a link to Event Page product from Lightbox titles
• add preconnect for faster fetching of data feeds and fonts
• add reload button on 200 (i.e. non-fetch related) errors that reloads app
• add a link to Settings from StatusBar on errors related to parameters
• add a comma to Feature's number of eqs when >= 10,000
• separate Forecast into its own bubble; add updated time
• increase timeout for DD catalog fetch
• bug fix: enable recovery from failed request w/ > 20,000+ eqs, missing param(s)
  • also, inform user how many matching events were returned when > 20,000
• bug fix: select default sidebar if sidebar param is invalid
• bug fix: allow new Mainshock selection while fetching previous MS in progress
• bug fix: escape '/' in eqid regex check (for FireFox); remove req'd attr
  • also, flag input when eqid is invalid
• disable Catalog 'Search' button during load (mitigate potential fetching bugs)
• disable Feature's settings during refresh (mitigate potential fetching bugs)
• disable 'Reset' button when Event ID input is cleared by user
• clean up, modernize and optimize CSS
• improve layout of Mainshock products using Masonry grid library
• improve fault visibility on alt. base layers
• improve tsunami button; add 'tsunami.gov', expand clickable area in details strip
• improve typography and verbiage
• improve Flatpickr UI
• improve transitions/animations
• shorten pane, sidebar URL params
• update libs (Leaflet, Plotly, Flatpickr, Luxon) to latest versions
• update Google Fonts to v2 API
• remove AbortController polyfill