chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

server/utils/opensearch.ts

@@ -0,0 +1,12 @@
+export const opensearchResponse = (): string => {
+  return `
+<OpenSearchDescription xmlns="http://a9.com/-/spec/opensearch/1.1/" xmlns:moz="http://www.mozilla.org/2006/browser/search/">
+  <ShortName>Outline</ShortName>
+  <Description>Search Outline</Description>
+  <InputEncoding>UTF-8</InputEncoding>
+  <Image width="16" height="16" type="image/x-icon">${process.env.URL}/favicon.ico</Image>
+  <Url type="text/html" method="get" template="${process.env.URL}/search/{searchTerms}?ref=opensearch"/>
+  <moz:SearchForm>${process.env.URL}/search</moz:SearchForm>
+</OpenSearchDescription>
+`;
+};