feat: more customization commands

[jahvon]

Introduces theme customization a new config subcommand, toggling of notifications via a subcommand, and changing the default timeout via a subcommand

[codecov]

Codecov Report

Attention: Patch coverage is 31.06061% with 91 lines in your changes missing coverage. Please review.

Project coverage is 37.63%. Comparing base (74748d8) to head (6b7921b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/internal/config.go	41.09%	40 Missing and 3 partials ⚠️
types/config/config.go	5.71%	33 Missing ⚠️
internal/context/context.go	0.00%	4 Missing ⚠️
types/executable/executable.go	0.00%	2 Missing and 1 partial ⚠️
cmd/internal/exec.go	0.00%	2 Missing ⚠️
cmd/internal/helpers.go	0.00%	2 Missing ⚠️
internal/io/styles.go	66.66%	1 Missing and 1 partial ⚠️
cmd/internal/library.go	0.00%	1 Missing ⚠️
cmd/internal/secret.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #175      +/-   ##
==========================================
- Coverage   37.71%   37.63%   -0.08%     
==========================================
  Files          81       81              
  Lines        5714     5816     +102     
==========================================
+ Hits         2155     2189      +34     
- Misses       3129     3192      +63     
- Partials      430      435       +5     

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