Housekeeping chores (#174)

* Add `exports` and `main` entry point

* Add `.npmignore`

* Update the `release-it` package and add `release` script

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: DmitrySharabin

.npmignore

@@ -0,0 +1,9 @@
+# Demo site (deployed to inspirejs.org, not part of the library)
+index.html
+CNAME
+_headers
+_redirects
+netlify.toml
+
+# Dev-only config (not used at runtime)
+postcss.config.js