DOC: remove older whatsnew

[jreback]

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[jreback]

@jorisvandenbossche what do you think? should remove 0.17 as well? 0.18? (e.g. keep last 2 major releases).

Idea is that this will make docs a bit shorter / build faster (slightly). not sure if its is worth though.

[codecov]

Codecov Report

Merging #15809 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #15809      +/-   ##
==========================================
- Coverage      91%   90.99%   -0.02%     
==========================================
  Files         143      143              
  Lines       49384    49384              
==========================================
- Hits        44944    44936       -8     
- Misses       4440     4448       +8

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.56% <0%> (-0.1%)	⬇️
pandas/io/parsers.py	95.51% <0%> (ø)	⬆️
pandas/core/common.py	91.3% <0%> (+0.33%)	⬆️

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[jorisvandenbossche]

I personally would not remove them. I am more in favor of #6856 -> converting examples to static code-blocks (keeping behaviour as when released, instead of updating examples), which also makes it a lot faster to build.

Although I am maybe a bit too 'attached' to the older whatsnew docs (I regularly search through them, but maybe this is rather uncommon behaviour as I am a dev).

[jreback]

@jorisvandenbossche ahh I c, didn't even know that issue existed! ok that actually makes sense. I tagged that a bit. closing then.

[jorisvandenbossche]

Something else we should do, is starting a separate page at a certain point, instead of one huge (or moving the older to a separate page, but problem with that is that it breaks links)

[jreback]

@jorisvandenbossche yep, though I think we have a reorg on the whole doc structure somewhere....