adapt index.md

[LasNikas]

No description provided.

[codecov]

Codecov Report

Merging #165 (2fd1379) into dev (82d466a) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #165      +/-   ##
==========================================
+ Coverage   49.77%   49.95%   +0.17%     
==========================================
  Files          38       38              
  Lines        2224     2216       -8     
==========================================
  Hits         1107     1107              
+ Misses       1117     1109       -8     

Flag	Coverage Δ
unit	49.95% <ø> (+0.17%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rc/schemes/fluid/weakly_compressible_sph/system.jl	62.50% <ø> (ø)

... and 1 file with indirect coverage changes