fix(baseline): update icons, add text to feedback link

also address review from prior PR:
#10128 (review)
- configure svgo to automatically remove height/width and add viewbox,
  and do so on baseline icons
- use classes instead of first/last-child for links
- don't show copy if low_date is undefined (it should always be defined
  if baseline is low/high, but just in case)

client/config/webpack.config.js

@@ -385,9 +385,6 @@ function config(webpackEnv) {
                   options: {
                     prettier: false,
                     svgo: false,
-                    svgoConfig: {
-                      plugins: [{ removeViewBox: false }],
-                    },
                     titleProp: true,
                     ref: true,
                   },