Normalize URLs and confirm canonical URLs

[carlgieringer]

TODO

• Remove anchors target icon from UI (noisy and irrelevant to text fragment URLs)
• Use the found quotation in constructing the view URL’s text fragment.
• Test canonical request
• schema updates
• Lambda deploy
• Normalize existing URLs (Backfill URL normalization and canonicalization #494)
• Confirm canonical URL for existing URLs (Backfill URL normalization and canonicalization #494)

Discovered during PR: premiser-ui's webpack.config.ts cannot depend on howdju-common because webpack uses ts-node for ts config files, which does not support importing ES modules (normalize-url is ESM.) If we really need the webpack config to depend on howdju-common, we might try esbuilding the webpack config and then running webpack on the built config.

[github-actions]

Changed-files coverage summary

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