VOTE-2040: Legacy site alert block content

[mlloydbixal]

Jira ticket

VOTE-2040

Description

Replaces hard coded alert component for legacy site link with a content block. The block has been created on production where ID is 20. Translations being added on production.

Deployment and testing

Post deploy

1. Test again with translations and block id that are on production

QA/Testing instructions

1. Create site alert block (this should have id 20 but if not update line 60 of page.html.twig to match your environment)
2. Confirm block shows on pages where translation is marked as outdated
3. Add translations for block and confirm it translates

Checklist for the Developer

• A link to the JIRA ticket has been included above.
• No merge conflicts exist with the target branch.
• Automated tests have passed on this PR.
• A reviewer has been designated.
• Deployment and testing steps have been documented above, if applicable.

Checklist for the Peer Reviewers

• The file changes are relevant to the task objective.
• Code is readable and includes appropriate commenting.
• Code standards and best practices are followed.
• QA/Test steps were successfully completed, if applicable.
• Applicable logs are free of errors.

[clmedders]

LGTM - was able to test that the block only worked when a translation was outdated and worked as expected