Fixes for Algolia and Bootstrap

- switch to instantsearch 7 API
- address breaking changes in boostrap 5
- fix: incorrect path parsing for 404 page search
- fix: race condition in global search bar initialization
- fix: honor system dark mode preference when no local preference is set
Also replaced pretty-quick with lint-staged, as new prettier is unsupported by the former

.husky/pre-commit

@@ -1,4 +1,4 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
-npx pretty-quick --staged --pattern 'src/**/*.js' --pattern 'gatsby-*.js'
+npx lint-staged

gatsby-ssr.js

@@ -8,8 +8,9 @@ exports.onRenderBody = ({ setPreBodyComponents }) => {
         __html: `
           const storedDark = window.localStorage.getItem('dark');
           const inferredDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
-          if (storedDark === 'true' || (storedDark === null && inferredDark)) {
+          if (storedDark === 'true' || (storedDark !== false && inferredDark)) {
             document.documentElement.classList.add('dark');
+            document.documentElement.dataset['bsTheme'] = 'dark';
           }
         `,
       },