Update information below EOS plot

[edan-bainglass]

From @giovannipizzi

For the sentence at the bottom, now we say "Comparison of the Birch-Murnaghan fit of the pseudopotential equation of state ("Fit") with the reference all-electron results ("Wien2k”).”. But “FIT” is never used, and I don’t think we are using Wien2k (or we shouldn’t - I would say with the reference all-electron results ["REF (AE average)”] averaged between Fleur and Wien2K from E. Bosoni et al., How to verify the precision of density-functional-theory implementations via reproducible and universal workflows, Nat. Rev. Phys. 6, 45 (2024)

[edan-bainglass]

@giovannipizzi can you please state exactly what you'd like to say at the bottom of the EOS page? Note that any pseudo-specific info can be captured in the now-implemented legend hover tooltip (also referenced here).

[giovannipizzi]

This is also related to #14 probably. I can tell you the exact sentence next week