fix(3155991918): redundant purple border on Discord button

[dan-ziv]

Description of the Changes

Remove border CSS from SideButton component.

Solves #3155991918

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Checklist

• [x] Manually tests of the main Application flows are done and passed.
• [ ] New unit / functional tests have been added (whenever applicable).
• [ ] Docs have been updated (whenever relevant).
• [x] PR title is follow the Conventional Commits convention: <type>[optional scope]: <description>, e.g: fix: prevent racing of requests

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This change is 

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[dan-ziv]

:tada: This PR is included in version 1.9.0-dev.8 :tada:

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[dan-ziv]

:tada: This PR is included in version 1.9.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[dan-ziv]

:tada: This PR is included in version 1.9.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: