allow searching for atoms inside backticks (#1960)

In the LV repo you were not able to search for atoms inside backticks,
for example when searching for "validate_attrs" the corresponding option
of the `Phoenix.Component.slot/3` macro could not be found.

This commit fixes this by stripping the backticks from tokens and also
removing trailing colons.

assets/js/search-page.js

@@ -161,6 +161,12 @@ function docTokenFunction (token) {
   const namespaceRegex = /\:|\./
   let toSplitWords = token.toString()
 
+  // clean up leading and trailing backticks
+  if (toSplitWords.startsWith('`') && toSplitWords.endsWith('`')) {
+    toSplitWords = toSplitWords.slice(1, -1)
+    tokens.push(token.clone().update(() => toSplitWords))
+  }
+
   if (arityRegex.test(toSplitWords)) {
     const withoutArity = token
       .toString()
@@ -188,6 +194,10 @@ function docTokenFunction (token) {
     // also make it searchable as foo_bar
     toSplitWords = toSplitWords.substring(1)
     tokens.push(token.clone().update(() => toSplitWords))
+  } else if (toSplitWords.startsWith(':')) {
+    // allow searching for atoms without `:`
+    toSplitWords = toSplitWords.substring(1)
+    tokens.push(token.clone().update(() => toSplitWords))
   }
 
   // Now split the function name (or the token, if that's all we had),