[openstreetmap/openstreetmap-website] Drop some legacy browser support code (PR #5556)

[Tom Hughes]

This drops the ES6 polyfill which is a bit pointless since #5421 allows ES2021 code now.

It also drops an IE specific legacy favicon tag, which allows us to drop the dependency on the browser gem.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5556

-- Commit Summary --

  * Drop ES6 polyfill
  * Drop IE specific favicon support

-- File Changes --

    M Gemfile (3)
    M Gemfile.lock (2)
    M app/views/layouts/_head.html.erb (1)
    M app/views/layouts/_meta.html.erb (1)
    D config/initializers/browser.rb (15)
    D vendor/assets/polyfill/es6.js (6787)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5556.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5556.diff

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