Added page content parsing to up-rank header text in search

This adds parsing of page content so that headers apply a boost to
scores in the search term index.
Additionally, this merges title and content terms to reduce the amount
of stored terms a little.
Includes testing to cover.

app/Entities/Models/Book.php

@@ -24,7 +24,7 @@ class Book extends Entity implements HasCoverImage
 {
     use HasFactory;
 
-    public $searchFactor = 2;
+    public $searchFactor = 1.5;
 
     protected $fillable = ['name', 'description'];
     protected $hidden = ['restricted', 'pivot', 'image_id', 'deleted_at'];

app/Entities/Models/Bookshelf.php

@@ -13,7 +13,7 @@ class Bookshelf extends Entity implements HasCoverImage
 
     protected $table = 'bookshelves';
 
-    public $searchFactor = 3;
+    public $searchFactor = 1.5;
 
     protected $fillable = ['name', 'description', 'image_id'];
 

app/Entities/Models/Chapter.php

@@ -16,7 +16,7 @@ class Chapter extends BookChild
 {
     use HasFactory;
 
-    public $searchFactor = 1.3;
+    public $searchFactor = 1.5;
 
     protected $fillable = ['name', 'description', 'priority', 'book_id'];
     protected $hidden = ['restricted', 'pivot', 'deleted_at'];

app/Entities/Models/Entity.php

@@ -238,20 +238,12 @@ abstract class Entity extends Model implements Sluggable, Favouritable, Viewable
         return mb_substr($this->name, 0, $length - 3) . '...';
     }
 
-    /**
-     * Get the body text of this entity.
-     */
-    public function getText(): string
-    {
-        return $this->{$this->textField} ?? '';
-    }
-
     /**
      * Get an excerpt of this entity's descriptive content to the specified length.
      */
     public function getExcerpt(int $length = 100): string
     {
-        $text = $this->getText();
+        $text = $this->{$this->textField} ?? '';
 
         if (mb_strlen($text) > $length) {
             $text = mb_substr($text, 0, $length - 3) . '...';

app/Entities/Models/Page.php

@@ -3,13 +3,13 @@
 namespace BookStack\Entities\Models;
 
 use BookStack\Entities\Tools\PageContent;
+use BookStack\Facades\Permissions;
 use BookStack\Uploads\Attachment;
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
-use Permissions;
 
 /**
  * Class Page.
@@ -64,10 +64,8 @@ class Page extends BookChild
 
     /**
      * Check if this page has a chapter.
-     *
-     * @return bool
      */
-    public function hasChapter()
+    public function hasChapter(): bool
     {
         return $this->chapter()->count() > 0;
     }