Add submissions form

Authors can now send a manuscript, headshot, bio, and pitch through a
real form instead of "Coming soon." Posts multipart to eec's new
/submissions endpoint (self-hosted, keeps the privacy policy's existing
no-third-party-SaaS promise true). Also documents the new data
collection in the privacy policy.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

content/submissions/_index.md

@@ -3,4 +3,6 @@ title: "Submissions"
 description: "How to submit work to Two Squirrels Press."
 ---
 
-Coming soon.
+We're always glad to look at character-driven speculative fiction and poetry. Markdown is our preferred format, but we'll happily take a `.docx`, `.odt`, or most other common document formats.
+
+Send us your manuscript along with a short bio, a brief description of the piece, and a headshot if you have one — the form below covers all of it.