refactor: Use markdown for the SiteAlert and Banner, remove HTML encoder dependency

[dzole0311]

Related Ticket: #1348

Description of Changes

• Remove the HTML encoder dependency
• Updated SiteAlert and Banner mocks to use markdown syntax, which is parsed via Parcel

Notes & Questions About Changes

{Add additonal notes and outstanding questions here related to changes in this pull request}

Validation / Testing

1. Tweak the content for the SiteAlert or the Banner in the the configuration file using markdown syntax for their content / text
2. Restart your build process (yarn clean may be needed)
3. Check that the changes are correctly displayed in the banner or site alert

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[hanbyul-here]

Thank you 🙇