[Shock][CLI] - VIM swp files causing exceptions when site rebuilds

[emmanuelrosa]

When using shock serve, editing a source file with the VIM editor triggers a rebuild of the website because VIM's .swp file is detected. static_shock then attempts the rebuild while also including the .swp file, which leads to an exception (since the .swp file really isn't a source file):

⚡ Generating a static site with Static Shock!

⚡ Clearing destination directory
Timing: 0.021s - Clear build directory - Deletes all pre-existing files in the project build directory

⚡ Applying plugins
Timing: 0.004s - Apply plugins - Every plugin configures the pipeline as desired

⚡ Loading layouts and components
Layout: /_includes/layouts/.docs_page.jinja.swp
Unhandled exception:
FileSystemException: Failed to decode data using encoding 'utf-8', path = '/home/emmanuel/projects/test/source/_includes/layouts/.docs_page.jinja.swp'
#0      _File._tryDecode (dart:io/file_impl.dart:707:7)
#1      _File.readAsStringSync (dart:io/file_impl.dart:718:7)
#2      StaticShock._loadLayoutsAndComponents (package:static_shock/src/static_shock.dart:358:27)
<asynchronous suspension>
#3      StaticShock.generateSite (package:static_shock/src/static_shock.dart:243:5)
<asynchronous suspension>
#4      main (file:///home/emmanuel/projects/test/bin/main.dart:25:3)
<asynchronous suspension>
Website build encountered an error during the build (255). Not refreshing pages.