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/gist.go

@@ -1,26 +1,43 @@
 package index
 
+var AllSearchFields = []string{"Username", "Title", "Description", "Filenames", "Extensions", "Languages", "Topics", "Content"}
+
+var SearchFieldMap = map[string]string{
+	"user":        "Username",
+	"title":       "Title",
+	"description": "Description",
+	"filename":    "Filenames",
+	"extension":   "Extensions",
+	"language":    "Languages",
+	"topic":       "Topics",
+	"content":     "Content",
+}
+
 type Gist struct {
-	GistID     uint
-	UserID     uint
-	Visibility uint
-	Username   string
-	Title      string
-	Content    string
-	Filenames  []string
-	Extensions []string
-	Languages  []string
-	Topics     []string
-	CreatedAt  int64
-	UpdatedAt  int64
+	GistID      uint
+	UserID      uint
+	Visibility  uint
+	Username    string
+	Description string
+	Title       string
+	Content     string
+	Filenames   []string
+	Extensions  []string
+	Languages   []string
+	Topics      []string
+	CreatedAt   int64
+	UpdatedAt   int64
 }
 
 type SearchGistMetadata struct {
-	Username  string
-	Title     string
-	Filename  string
-	Extension string
-	Language  string
-	Topic     string
-	All       string
+	Username    string
+	Title       string
+	Description string
+	Content     string
+	Filename    string
+	Extension   string
+	Language    string
+	Topic       string
+	All         string
+	Default     string
 }