Front ie11 support

[adamkendis]

Fixes #756
Fixes #765

Eslint error workaround

Eslint started throwing a strange error a few days ago.

TypeError: Cannot read property 'range' of null
Occurred while linting /home/runner/work/311-data/311-data/src/components/Comparison/TotalRequestsComparison.jsx:26

See https://github.com/hackforla/311-data/pull/763/checks?check_run_id=934365378

I found several issues re the same eslint error. See this issue. I used a workaround in the comments thread by adding/disabling two rules. This is a temporary solution.

IE11 support

It turned out that the most recent version of dfa node_module, a dependency of @react-pdf/fontkit is not transpiled from ES6 to ES5. Explicitly including these files for babel-loader while excluding everything else in node_modules didn't work - ended up being some issues with the transpiled code for @react-pdf with this method. npm installing the prior version of dfa ended up fixing the issue. There is a pending PR to fix this on dfa here. See issue on @react-pdf here

query-string latest version is also not IE11 compatible so this was reverted from 6 to 5. From the query-string readme:

This module targets Node.js 6 or later and the latest version of Chrome, Firefox, and Safari.
If you want support for older browsers, or, if your project is using create-react-app v1, use version 5: npm install query-string@5.

Also added the core-js/stable import to the frontend entrypoint for polyfills and updated @babel/preset-env config.

Other stuff

Updated footer links and added social media icons to footers. Moved version and privacy policy to left side of footers.

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