Provide a night theme for gitblock

[qy-liuhuo]

Fix #84

Provide a night theme for gitblock, Example is as follow:

You can use it by changing the url from profile-3d-contrib/profile-gitblock.svg to profile-3d-contrib/profile-night-gitblock.svg

[melogabriel]

I solved this problem that way:

https://github.com/melogabriel/melogabriel/blob/b8388b1d306f9038b43c2f7c62ceeffae92b0964/conf/github-profile-3d-contrib.json

This way the .svg is visible in both light and dark mode.

[yoshi389111]

@qy-liuhuo Thank you for your pull request.

I'm sure there are people who would like a night theme for gitblock.

However, I think that anyone who wants to do this can just specify their own custom JSON file in the SETTING_JSON environment variable and run it.

If you could resubmit the pull request by adding a sample of a custom JSON file under sample-settings, I would consider merging it.

[yoshi389111]

I'm going to close this issue/PR due to inactivity. If you're still interested in pursuing this, feel free to reopen it or open a new one. Thank you for your contribution!