[new]: adds a new option to enable/disable days of week

[adrienpoly]

<%= form_with model: Appointement.new, authenticity_token: true do |f| %>
  <%= f.text_field :start_time,
    data: {
      controller: "flatpickr",
      flatpickr_disable_days_of_week: [5,6], #disables saturdays and sundays 
      flatpickr_min_date: Time.zone.now #disables past dates
    } %>
<% end %>

or the opposite behavior using flatpickr_enable_days_of_week

resolves #21

[codecov[bot]]

Codecov Report

Merging #23 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #23   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines          45     60   +15     
=====================================
+ Hits           45     60   +15

Impacted Files	Coverage Δ
src/config_options.js	100% <100%> (ø)	:arrow_up:
src/stimulus-flatpickr.js	100% <100%> (ø)	:arrow_up:

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