Implemented custom font specification for config export image cli

[jasonm23]

Prerequisites

• I have read and understood the contributing guide.
• The commit message follows the conventional commits guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added/updated (for bug fixes / features).

Description

Re-implementation of custom font settings via

config export image \
  [--font MyNerdFontExample.ttf/otf] \
  [--font-regular MyNerdFontExample.ttf/otf] \
  [--font-bold MyNerdFontExample-Bold.ttf/otf] \
  [--font-italic MyNerdFontExample-Italic.ttf/otf]

Reduced testing profile to only include new functionality in the PR, since golang opentype is responsible for reading fonts etc.

[JanDeDobbeleer]

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[jasonm23]

@JanDeDobbeleer - note that you have write permission to ocodo/oh-my-posh already.

[JanDeDobbeleer]

@jasonm23 that's an automated message. You should see that option here in the sidebar.

[jasonm23]

@jasonm23 that's an automated message. You should see that option here in the sidebar.

Should, isn't. Mentioned in the previous PR. You have write access to the whole repo (ocodo/oh-my-posh) You remember the other PR, right?

[jasonm23]

For ref:

[jasonm23]