feat(search): add pagefind search engine support (#738)

* feat(search): add native pagefind support

* chore: code review and change

---------

Co-authored-by: Cell <1024@lruihao.cn>

hugo.toml

@@ -507,7 +507,7 @@ dark = "#151b23"
 # Search config
 [params.search]
 enable = false
-# type of search engine ["algolia", "fuse", "cse", "post-chat"]
+# type of search engine ["algolia", "fuse", "pagefind", "cse", "post-chat"]
 type = "fuse"
 # max index length of the chunked content
 contentLength = 4000
@@ -541,6 +541,19 @@ ignoreLocation = false
 useExtendedSearch = false
 ignoreFieldNorm = false
 
+# Pagefind search config (http://pagefind.app/)
+[params.search.pagefind]
+# Pagefind bundle and index directory
+bundlePath = "pagefind/"
+# debounce timeout in milliseconds, set to 0 to disable debounce
+debounceTimeoutMs = 300
+# whether to respect FixIt built-in search visibility rules
+useBuiltInFilters = true
+# optional sort field, current recommended built-in value: "date"
+sortBy = ""
+# sort order for sortBy: ["asc", "desc"]
+sortOrder = "desc"
+
 # FixIt 0.3.16 | NEW Custom Search Engine (CSE)
 [params.cse]
 # search engine: ["google", "bing"]