feat: search all fields (#622)

* ✨ feat(search): search all feature

- add Description field to Gist struct and index it
- extend SearchGistMetadata with Description and Content
- update Bleve and Meilisearch to index and search Description
- modify ParseSearchQueryStr to parse description: and content: keywords
- update templates and i18n for new search options

* Fix test

* Set content by default

Signed-off-by: Thomas Miceli <tho.miceli@gmail.com>

* Config to define default searchable fields

Signed-off-by: Thomas Miceli <tho.miceli@gmail.com>

---------

Signed-off-by: Thomas Miceli <tho.miceli@gmail.com>
Co-authored-by: Thomas Miceli <tho.miceli@gmail.com>

internal/index/indexer.go

@@ -17,7 +17,7 @@ type Indexer interface {
 	Reset() error
 	Add(gist *Gist) error
 	Remove(gistID uint) error
-	Search(query string, metadata SearchGistMetadata, userId uint, page int) ([]uint, uint64, map[string]int, error)
+	Search(metadata SearchGistMetadata, userId uint, page int) ([]uint, uint64, map[string]int, error)
 }
 
 type IndexerType string
@@ -125,7 +125,11 @@ func RemoveFromIndex(gistID uint) error {
 	return (*idx).Remove(gistID)
 }
 
-func SearchGists(query string, metadata SearchGistMetadata, userId uint, page int) ([]uint, uint64, map[string]int, error) {
+// SearchGists returns a list of Gist IDs that match the given search metadata.
+// If the indexer is not enabled, it returns nil, 0, nil, nil.
+// If the indexer is not initialized, it returns nil, 0, nil, fmt.Errorf("indexer is not initialized").
+// The function returns an error if any.
+func SearchGists(metadata SearchGistMetadata, userId uint, page int) ([]uint, uint64, map[string]int, error) {
 	if !IndexEnabled() {
 		return nil, 0, nil, nil
 	}
@@ -135,7 +139,7 @@ func SearchGists(query string, metadata SearchGistMetadata, userId uint, page in
 		return nil, 0, nil, fmt.Errorf("indexer is not initialized")
 	}
 
-	return (*idx).Search(query, metadata, userId, page)
+	return (*idx).Search(metadata, userId, page)
 }
 
 func DepreactionIndexDirname() {