feat(progress-bar-border): implement progress bar border options for cards with lang progress bar

[nikelasi]

Description

This PR attempts to introduce a feature wanted in #3184.

Code Changes

• introduces progress_bar_border_color and progress_bar_border_thickness options for wakatime and top-langs statistics cards
• updates readme doc to include the above options and describe their behavior
• updates renderWakatimeCard.test.js tests to increase coverage for progress bar border cases

Samples

Top Languages	layout=compact progress_bar_border_color=000	layout=normal&langs_count=2 progress_bar_border_color=0f636d progress_bar_border_thickness=2
WakaTime	layout=normal&langs_count=3 progress_bar_border_color=ffcd38 progress_bar_border_thickness=3	layout=compact&langs_count=4 progress_bar_border_color=000

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