chore(demo): Changelog update description of 3.0.0-release

[nsbarsukov]

3.0.0 (2022-08-30)

⚠ BREAKING CHANGES

• Update to Angular 12 (#2080,
  #2097, #2110).
  Enable Ivy by default (#2076). Drop legacy View Engine-support.
• Migrate to Polymorpheus 4.x.x
  (#2165).
• Update supported browser versions. Drop support of legacy not-chromium Edge (EdgeHTML)
  (#2318). Bump supported Safari to 12.1+
  (#2391).
• All exported entities without tui-prefix was renamed to the same one with prefix: functions, constants, pipes,
  classes, etc.
• styles: move all global styles from @taiga-ui/core to new optional package @taiga-ui/styles
  (#2320). Delete tui-palette.less (data-tui-background and
  data-tui-color global states) (#2473).
• core: Dropdown refactor dropdowns completely (#2389).
• kit: remove legacy InputFile component (#2087). Use new
  InputFiles component instead.
• core: Hint support 12 directions (#2256). Add context input
  (#2273). Add new directive HintDescribe
  (#2495). HintController remove separate module (move inside
  TuiHintModule) (#2484).
• core: TuiTextfieldController delete tuiTextfieldAutocomplete, tuiTextfieldExampleText,
  tuiTextfieldInputMode, tuiTextfieldMaxLength, tuiTextfieldType
  (#2410) in favor of native input alternatives. Allow passing icons
  at both sides simultaneously in textfield components (#2037).
• kit: Slider | InputSlider | Range | InputRange drop all deprecated API
  (#2200, #2207,
  #2215, #2243).
  Use strict version of TuiKeySteps (#2220). Delete legacy
  <tui-slider /> (#2184).
• kit: Action new selector button[tuiAction], a[tuiAction]
  (#2479). Better customization + new API
  (#2505)
• kit: Stepper rename state input (=> stepState) to avoid collision with routerLink
  (#2437).
• core: remove tuiExpandContent directive (#2501)
• kit: DataListDropdownManager move into separate module
  (#2317)
• cdk: Let directive can emit null (#2496)
• cdk: remove deprecated setNativeFocused,tuiCustomEvents, tuiPadStart, getClosestElement, fallbackValue
  (#2074, #2276).
  Use native alternatives.
• core: tuiFormatNumber(value, configs) new function signature
  (#2309)
• cdk: tuiGetClosestFocusableElement(configs) new function signature
  (#2436)
• core: new names of css breakpoints (#2393).
• core: remove deprecated pluralize (#2222). Use Angular built-in
  I18nPluralPipe.
• core: move fonts to separate file taiga-ui-fonts.less (#2132)
• Replace deprecated directives (*tuiTab, *tuiBreadcrumb,[tuiToolbarTool]) with universal tuiItem-directive
  (#2069)
• Move all color-converter utils (addon-editor / addon-doc => cdk)
  (#2280)
• Remove tui-wrapper, tui-group, table-mode, field-error component, tui-breadcrumb items
  (#2121).
• kit: remove deprecated TUI_MOBILE_AWARE (#2099).
• core: AlertComponent use new context (#2362)
• cdk: PortalService switch to using PolymorpheusComponent
• addon-commerce, addon-chart: remove deprecated enums (#2095)
• remove deprecated core-enums, TuiColor, colorFallback, DEFAULT_COLORS, TuiColorHandler
  (#2158)
• remove date-time related deprecations, EMPTY_VALIDATOR (#2164)
• remove deprecated properties from AbstractTuiInteractive (#2124)
• remove autofill enums (#2500).

Bug Fixes

• core: prevent injection conflict with CSS global interface
  (#2508)

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