sort custom services alphabetically

[alexfornuto]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

This PR sorts the Custom Services page, to make it easier to find the service one is looking for. I know one might argue that one can just search for the service name, but some folks still scan visually, and/or might not know the correct spelling/spacing of the service they are looking for.

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)
• Documentation update (This option doesn't exist in your template, BTW. Consider adding it.)

Checklist:

• I've read & comply with the contributing guidelines (Though FWIW, your guidelines don't cover documentation updates, so I guess I'm not in compliance.)

• I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

  Irrelevant for documentation changes.

• I have made corresponding changes to the documentation (README.md).

  Considering I'm making a documentation update that isn't in README.md, consider updating this template so others know they might need to adjust elsewhere.

• I've checked my modifications for any breaking changes, especially in the config.yml file

  Irrelevant for documentation updates.

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