fix: Allows DB URL or individual values in .env

[stoopidJSON]

In addition to .env updates this will allow for some flexibility around
user seeding.

Todos

• Tests

Impacted Areas in Application

List general components of the application that this PR will affect:

• Allows different connection methods for db.

[codecov]

Codecov Report

Merging #83 into master will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
- Coverage   68.54%   68.52%   -0.02%     
==========================================
  Files          12       12              
  Lines         337      340       +3     
==========================================
+ Hits          231      233       +2     
- Misses        106      107       +1     

Impacted Files	Coverage Δ
src/models/entity.js	85.71% <ø> (ø)
src/models/index.js	90.47% <66.66%> (-3.97%)	⬇️

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