Responder at editor-checks

[maelle]

Create authors entries in Airtable "authors" table

• Simply GitHub usernames of authors1 and authors-others

Create entry in Airtable "packages" table

• Package name (basename from GitHub repo)
• Submission URL
• Repo URL
• author1
• author-others
• editor (GitHub username)
• submission date

[maelle]

• to be added to "seeking reviewers" responder
• the responder "add blabla to reviewers" should check the package entry exists and add it otherwise (just to be sure the entry is created, as it's easy for editors to forget the "seeking reviewers" responder)

[maelle]

Also added two fields, edited first comment