Custom span size in service group

[chain710]

Description

Some service group require larger span size. Add optional span option under services section
Hope it's useful 😉

config looks like this

services:
  - name: "Applications"
    icon: "fas fa-cloud"
    items: ...
  - name: "Surveillance"
    icon: "fas fa-cloud"
    span: 6
    items: ...

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I've read & comply with the contributing guidelines
• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• I have made corresponding changes to the documentation (README.md).
• I've checked my modifications for any breaking changes, especially in the config.yml file

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