message: feat: mark constants `as const`
diff: export const PROJECT_NAME = 'Nextclade' as const
  -export const PROJECT_DESCRIPTION = 'Clade assignment, mutation calling, and quality control right inside your browser'
  +export const PROJECT_DESCRIPTION = 'Clade assignment, mutation calling, and quality control right inside your browser' as const
  export const COPYRIGHT_YEAR_START = 2020 as const
  export const COMPANY_NAME = 'Nextstrain developers' as const
  @@ -9,13 +9,13 @@ export const SAFARI_PINNED_TAB_COLOR = '#555555' as const
  export const MS_TILE_COLOR = '#2b5797' as const
  export const BASE_MIN_WIDTH_PX = 4 as const
  -export const EXPORT_CSV_FILENAME = 'nextclades.csv'
  -export const EXPORT_JSON_FILENAME = 'nextclades.json'
  +export const EXPORT_CSV_FILENAME = 'nextclade.csv' as const
  +export const EXPORT_JSON_FILENAME = 'nextclade.json' as const
  export const URL_GITHUB = 'https://github.com/neherlab/webclades' as const
  export const URL_GITHUB_FRIENDLY = 'github.com/neherlab/webclades' as const
  -export const TWITTER_USERNAME = '@nextstrain'
  +export const TWITTER_USERNAME = '@nextstrain' as const
  // Borrowed from Nextstrain Auspice
  // https://github.com/nextstrain/auspice/blob/05efebfd5eba8a7d086132cf8a182176118b7c28/src/util/globals.js#L90-L92
  @@ -30,7 +30,7 @@ export const GENOTYPE_COLORS = [
  '#DF4327',
  '#C4B945',
  '#75B681',
  -]
  +] as const
  // Borrowed with modifications from Nextstrain.org
  // https://github.com/nextstrain/nextstrain.org/blob/master/static-site/src/components/splash/title.jsx
  @@ -44,4 +44,4 @@ export const TITLE_COLORS = [
  '#E49938',
  '#E67030',
  '#DE3C26',
  -]
  +] as const
  