CLI script for migrating from Legacy export archive to OJS

[gabestein]

• Imports Pubs, Pages, and Collections (e.g. as tags) — ideally, imports both HTML and PDF. May need to use JATS for content.
• Imports Pub authors/contributors if possible, with ORCID
• Runs locally on *nix machines (and hopefully windows)
• Does not rely on Legacy API or access to Legacy DB or site
• Can rely on downloading from assets.pubpub.org
• Downloads all assets/images/figures/files referenced in JSON and rewrites links as needed
• Rewrites links to same domain as community as relative links
• Specifically, rewrites image links using srcset as src
• Results in either a file that can be uploaded to OJS or, perhaps better/easier, allows user to import via their instance's API given credentials
• Lives in new repo where we'll be putting mi

[gabestein]

Still needs:

• doi backports

@tefkah to spend a day looking at if it's possible to download assets from assets.pubpub.org, upload to OJS storage, and rewrite links to serve from there

[gabestein]

• Windows errors (fixed)
• Sentry error reporting
• PDF Import issues: text hidden?
• "Formatted" download corrupted when imported