Add configuration option to allow more file types in the media directory

[emmadesilva]

Added configuration option hyde.media_extensions to allow you to specify additional comma separated media file types. Fixes #39;

config('hyde.media_extensions', 'png,svg,jpg,jpeg,gif,ico,css,js'))

[codecov]

Codecov Report

Merging #105 (10baa29) into master (9161696) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #105   +/-   ##
=========================================
  Coverage     99.01%   99.01%           
  Complexity      742      742           
=========================================
  Files            95       95           
  Lines          1928     1929    +1     
=========================================
+ Hits           1909     1910    +1     
  Misses           19       19           

Impacted Files	Coverage Δ
...kages/framework/src/Services/CollectionService.php	100.00% <100.00%> (ø)

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