Create small bar chart for facets

[trieloff]

• refactor(rum-explorer): use custom element for number formatting
• fix(rum-explorer): make sure all custom elements are defined uniformly
• fix(rum-explorer): align all html files
• fix(rum-explorer): control number formatting
• fix(rum-explorer): use common number formatting in sidebar
• fix(rum-explorer): guard against bad max precision
• refactor(rum-explorer): use one central number formatter
• fix(rum-explorer): do not append more and more extras when toggling facets
• feat(rum-explorer): provide minimal bar chart to facts

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Commits

* [903c93d](https://github.com/adobe/helix-website/commit/903c93dc229765a513f29cc6d8f607aab9768f93) :white_check_mark: (latest) * [df0b748](https://github.com/adobe/helix-website/commit/df0b748200af3e095765f99630abfb7c19bf38be) :x: * [c5f5f21](https://github.com/adobe/helix-website/commit/c5f5f21139013d919106d866941b7580d52f7475) :x: * [97d0a2b](https://github.com/adobe/helix-website/commit/97d0a2b5b97059f5309b4ae60bb483881a6b36be) :x: * [9cf4a11](https://github.com/adobe/helix-website/commit/9cf4a11beae0bc647f7e1c7b364002d765313ff1) :x: * [23b3858](https://github.com/adobe/helix-website/commit/23b3858e4ff3a5935a72483a0e3d0cea54a69cbb) :x: * [a589312](https://github.com/adobe/helix-website/commit/a589312f95c498b89cd852b9ed4029a7985e979d) :x: * [f1fc099](https://github.com/adobe/helix-website/commit/f1fc099c621061f6c029d07135b15c47ba1588db) :x: * [bbc8dff](https://github.com/adobe/helix-website/commit/bbc8dfff4dc5e35c967d0d0d8c0c76bb4131ac39) :x: