Export (#619)

* export feature

* adjusted example

* fix eln

* fixing the name

* update CITATION

---------

Co-authored-by: Lukas Pielsticker <50139597+lukaspie@users.noreply.github.com>

Author: sanbrock

CITATION.cff

@@ -4,7 +4,7 @@ message:
   If you use this software, please cite it using the
   metadata from this file.
 type: software
-version: 0.10.3
+version: 0.10.4
 authors:
   - given-names: Sherjeel
     family-names: Shabih

src/pynxtools/nomad/examples/IV_temp.schema.archive.yaml

@@ -1,7 +1,7 @@
 definitions:
   name: "IV Temp ELN Example"
   sections:
-    ELN_for_iv_temp:
+    ELN for iv_temp:
       base_sections:
         - "pynxtools.nomad.dataconverter.NexusDataConverter"
         - "nomad.datamodel.data.EntryData"