Miscellaneous server refactor

[brandonchinn178]

• Consolidate loading environment variables
• Manage datasources in context manually (we aren't really using the DataSource superclass, which mostly provides functionality for caching)

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[codecov[bot]]

Codecov Report

Merging #516 (ec09d04) into master (edaa6a9) will decrease coverage by 0.02%. The diff coverage is 70.58%.

@@            Coverage Diff             @@
##           master     #516      +/-   ##
==========================================
- Coverage   94.00%   93.98%   -0.03%     
==========================================
  Files          19       19              
  Lines         217      216       -1     
  Branches       25       25              
==========================================
- Hits          204      203       -1     
  Misses          6        6              
  Partials        7        7              

Impacted Files	Coverage Δ
server/src/song/resolvers.ts	100.00% <ø> (ø)
server/src/db.ts	66.66% <42.85%> (+3.03%)	:arrow_up:
server/src/env.ts	66.66% <66.66%> (ø)
server/src/apollo/context.ts	100.00% <100.00%> (ø)
server/src/apollo/index.ts	92.30% <100.00%> (ø)
server/src/song/api.ts	100.00% <100.00%> (ø)

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