Remove body property from Markdown

[caendesilva]

About

Since the Markdown body is now strongly typed as a Markdown object, we have duplicate properties for the Markdown body (which is also stored in the Markdown object). This PR removes that.

Before

^ Hyde\Framework\Models\Pages\MarkdownPage^ {#3014
  +markdown: Hyde\Framework\Models\Markdown^ {#3009
    +body: "foo bar"
  }
  +body: "foo bar"
}

After

^ Hyde\Framework\Models\Pages\MarkdownPage^ {#3006
  +markdown: Hyde\Framework\Models\Markdown^ {#3014
    +body: "foo bar"
  }
}

[codecov]

Codecov Report

Merging #338 (5b6eb22) into master (0b5feb0) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #338      +/-   ##
============================================
- Coverage     99.85%   99.85%   -0.01%     
  Complexity      831      831              
============================================
  Files            95       95              
  Lines          2051     2050       -1     
============================================
- Hits           2048     2047       -1     
  Misses            3        3              

Impacted Files	Coverage Δ
...s/framework/src/Contracts/AbstractMarkdownPage.php	100.00% <ø> (ø)
.../Actions/GeneratesDocumentationSearchIndexFile.php	100.00% <100.00%> (ø)
...ages/framework/src/Concerns/HasTableOfContents.php	100.00% <100.00%> (ø)
...ckages/framework/src/Models/Pages/MarkdownPost.php	100.00% <100.00%> (ø)
...mework/src/Modules/Markdown/MarkdownFileParser.php	100.00% <100.00%> (ø)

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