Add a browse command

[eudoxia0]

Ahhhh I'm broooooowsing

[codecov]

Codecov Report

❌ Patch coverage is 1.60116% with 676 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.44%. Comparing base (82b7e95) to head (f27afb4).

Files with missing lines	Patch %	Lines
src/cmd/browse/server.rs	0.00%	169 Missing ⚠️
src/cmd/browse/render.rs	0.00%	126 Missing ⚠️
src/cmd/browse/templates/layout.rs	0.00%	74 Missing ⚠️
src/cmd/browse/views/card_cloze.rs	0.00%	73 Missing ⚠️
src/cmd/browse/templates/entries.rs	0.00%	64 Missing ⚠️
src/types/card.rs	0.00%	40 Missing ⚠️
src/cmd/browse/views/card_basic.rs	0.00%	34 Missing ⚠️
src/db.rs	0.00%	32 Missing ⚠️
src/cmd/browse/shared/state.rs	0.00%	17 Missing ⚠️
src/cmd/browse/views/deck.rs	0.00%	17 Missing ⚠️
... and 4 more

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #191       +/-   ##
===========================================
- Coverage   91.46%   78.44%   -13.02%     
===========================================
  Files          32       43       +11     
  Lines        4055     4733      +678     
===========================================
+ Hits         3709     3713        +4     
- Misses        346     1020      +674     

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