message: docs: remove no longer relevant sections in build page
  `Backward compatibility with Lighthouse` and `Backward compatibility with CSS grid` sections are no longer relevant since Internet Explorer is no longer supported.
  PR Close
diff: @@ -319,35 +319,6 @@ Autoprefixer looks for the `browserslist` configuration when it prefixes your CS
  See the [browserslist repo](https://github.com/browserslist/browserslist) for more examples of how to target specific browsers and versions.
  -### Backward compatibility with Lighthouse
  -
  -If you want to produce a progressive web application and are using [Lighthouse](https://developers.google.com/web/tools/lighthouse/) to grade the project, add the following `browserslist` entry to your `package.json` file, in order to eliminate the [old flexbox](https://developers.google.com/web/tools/lighthouse/audits/old-flexbox) prefixes:
  -
  -```
  -"browserslist": [
  - "last 2 versions",
  - "not ie <= 10",
  - "not ie_mob <= 10"
  -]
  -```
  -
  -### Backward compatibility with CSS grid
  -
  -CSS grid layout support in Autoprefixer, which was previously on by default, is off by default in Angular 8 and higher.
  -
  -To use CSS grid with Internet Explorer 10/11, you must explicitly enable it using the `autoplace` option.
  -To do this, add the following to the top of the global styles file (or within a specific css selector scope):
  -
  -```
  -/* autoprefixer grid: autoplace */
  -```
  -or
  -```
  -/* autoprefixer grid: no-autoplace */
  -```
  -
  -For more information, see [Autoprefixer documentation](https://autoprefixer.github.io/).
  -
  {@a proxy}
  ## Proxying to a backend server
  