move projects to extra

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diff --git a/extra/README.md b/extra/README.md
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+# Extra code and docs
+
+Notes on applications.
diff --git a/extra/grobid_references/README.md b/extra/grobid_references/README.md
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diff --git a/extra/name_only_containers/README.md b/extra/name_only_containers/README.md
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+# Releases with container name only
+
+Fatcat contains releases with container name only. For each container name, we
+want to get a possible container identifier.
diff --git a/extra/oai_metadata/README.md b/extra/oai_metadata/README.md
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+# OAI metadata
+
+OJS and other publication platforms implement the OAI protocol. Given a record
+metadata set, determine, whether an item is already in the catalog.
+
+Matching by title only, or additional fields.
+
+```
+OCTAVIO PAZ: “NO PASARÁN”, EL POEMA QUE TRASCENDIÓ SU PROPIO TIEMPO
+Poemas de Rita Dove
+Entrevista con Jamie McKendrick
+The Disintegrating Concept of Homeland (Patria) in Two Poems by Jon Juaristi
+Critico, ergo sum: Poesía y discurso crítico
+Siempre hay que defender la poesía
+(Tanato)biografía poética sin yo desesperanzado.  Poesía non finito/Poesía especular
+Faúndez, Edson. Bajo la piel de tu capa
+```
+
diff --git a/extra/sitemap_title_list/README.md b/extra/sitemap_title_list/README.md
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