feat(theme): add tests for alert component

[emilcheva]

Description

Adds tests for theAlert component.
Fixes typo in the documentation pages (the default color for Alert is 'info', not 'primary'). In fact 'primary' does not exists in the FlowbiteColors -> Pick<FlowbiteColors, 'failure' | 'gray' | 'info' | 'success' | 'warning'>

Related to #500

Type of change

Please delete options that are not relevant.

• This change contains documentation update

Breaking changes

Please document the breaking changes if suitable.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Unit tests

Test Configuration:

N/A

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Base: 99.29% // Head: 99.29% // No change to project coverage 👍

Coverage data is based on head (dd6fbfe) compared to base (5f01946).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #549   +/-   ##
=======================================
  Coverage   99.29%   99.29%           
=======================================
  Files         131      131           
  Lines        5775     5775           
  Branches      480      480           
=======================================
  Hits         5734     5734           
  Misses         41       41           

Impacted Files	Coverage Δ
src/lib/components/Alert/Alert.tsx	100.00% <100.00%> (ø)

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[rluders]

Thank you! :)