add citation

Author: TorkelE

docs/src/steady_state_functionality/examples/bifurcationkit_periodic_orbits.md

@@ -96,18 +96,4 @@ In the plot we see that the period starts at around $18$ time units, and slowly
 
 ---
 ## [Citation](@id bifurcationkit_periodic_orbits_citation)
-If you use this functionality in your research, please cite the following paper to support the author of the BifurcationKit package:
-```
-@misc{veltz:hal-02902346,
- title = {{BifurcationKit.jl}},
- author = {Veltz, Romain},
- url = {https://hal.archives-ouvertes.fr/hal-02902346},
- institution = {{Inria Sophia-Antipolis}},
- year = {2020},
- month = Jul,
- keywords = {pseudo-arclength-continuation ; periodic-orbits ; floquet ; gpu ; bifurcation-diagram ; deflation ; newton-krylov},
- pdf = {https://hal.archives-ouvertes.fr/hal-02902346/file/354c9fb0d148262405609eed2cb7927818706f1f.tar.gz},
- hal_id = {hal-02902346},
- hal_version = {v1},
-}
-```
+If you use BifurcationKit.jl for your work, we ask that you **cite** the following paper!! Open source development strongly depends on this. It is referenced on [HAL-Inria](https://hal.archives-ouvertes.fr/hal-02902346) with *bibtex* entry [CITATION.bib](https://github.com/bifurcationkit/BifurcationKit.jl/blob/master/CITATION.bib).