Fix: add OpenGraph meta tags

[katspaugh]

What it solves

Resolves #3486

How this PR fixes it

Adds title, desc and image meta-tags, the same ones as on the landing page.

How to test

Send this link to Slackbot.

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[github-actions]

Deployment links

🟠 Rinkeby	⚪ Mainnet	🟣 Polygon	🟡 BSC	⚫ Arbitrum	🟢 Gnosis Chain

[iamacook]

💪

[coveralls]

Pull Request Test Coverage Report for Build 1829683077

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 33.649%

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Totals
Change from base Build 1829358790:	0.0%
Covered Lines:	3227
Relevant Lines:	8566

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💛 - Coveralls

[github-actions]

E2E Tests Failed
Check the results here: https://github.com/gnosis/safe-react-e2e-tests/actions/runs/1829717405

Failed tests:

• ❌ Read-only transaction creation and review Read-only transaction creation and review

[katspaugh]

I've tested, it works. Large preview on Telegram, too. ✅