prepare release 0.6.0

[orbeckst]

• for #174
• officially support Python 3.10 (keep support for Python 3.7 even though we could drop it with NEP29)
• updated docs
• update CHANGES

[codecov[bot]]

Codecov Report

Merging #181 (f1efb6c) into master (a1c0b09) will increase coverage by 0.15%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
+ Coverage   98.00%   98.16%   +0.15%     
==========================================
  Files          22       22              
  Lines        1305     1305              
  Branches      271      286      +15     
==========================================
+ Hits         1279     1281       +2     
  Misses          5        5              
+ Partials       21       19       -2     

Impacted Files	Coverage Δ
src/alchemlyb/convergence/convergence.py	100.00% <ø> (ø)
src/alchemlyb/parsing/gmx.py	98.12% <0.00%> (+0.62%)	:arrow_up:
src/alchemlyb/parsing/gomc.py	93.20% <0.00%> (+0.97%)	:arrow_up:

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