feature/backspace-remove-facet

[grimurd]

This adds the ability to remove a facet using backspace.

[codecov]

Codecov Report

Merging #42 into develop will decrease coverage by 0.45%.
The diff coverage is 8.33%.

@@             Coverage Diff             @@
##           develop      #42      +/-   ##
===========================================
- Coverage    20.82%   20.36%   -0.46%     
===========================================
  Files            1        1              
  Lines          317      329      +12     
  Branches        66       69       +3     
===========================================
+ Hits            66       67       +1     
- Misses         244      255      +11     
  Partials         7        7

Impacted Files	Coverage Δ
...les/ngx-magic-search/ngx-magic-search.component.ts	20.36% <8.33%> (-0.46%)	⬇️

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