remove whitespace at the bottom of the signer install page

[codecarrier1]

Description

• remove whitespace at the bottom of the signer install page

closes: #108

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Linked to Github issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• Test following procedure in docs/testing-workflow.md
• Updated relevant documentation in the code.
• Re-reviewed Files changed in the Github PR explorer.
• Update the version numbers properly:
  • Cargo.toml
  • ui/package.json
  • ui/public/about.html
  • ui/src-tauri/Cargo.toml
  • ui/src-tauri/tauri.conf.json
  • www/src/App.tsx

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Name	Status	Preview	Updated
manta-signer	✅ Ready (Inspect)	Visit Preview	Jun 15, 2022 at 11:54AM (UTC)