chore: improve readme

[altitude]

Signed-off-by: Clément Salaün salaun.clement@gmail.com

Title

Just improving the readme

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring / Technical debt

What parts of the code are impacted ?

None

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #258 (0c82d6f) into main (1f813f6) will decrease coverage by 0.93%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   70.82%   69.88%   -0.94%     
==========================================
  Files          75       75              
  Lines        3938     3938              
==========================================
- Hits         2789     2752      -37     
- Misses        906      944      +38     
+ Partials      243      242       -1     

Impacted Files	Coverage Δ
pkg/ledgertesting/storage.go	50.00% <0.00%> (-30.56%)	⬇️
pkg/storage/sqlstorage/flavor.go	34.04% <0.00%> (-19.15%)	⬇️
internal/pgtesting/testing.go	73.91% <0.00%> (-13.05%)	⬇️
pkg/core/posting.go	68.00% <0.00%> (-8.00%)	⬇️
pkg/storage/sqlstorage/mapping.go	79.48% <0.00%> (-7.70%)	⬇️
pkg/core/volumes.go	77.77% <0.00%> (-7.41%)	⬇️
pkg/core/metadata.go	71.42% <0.00%> (-4.77%)	⬇️
pkg/storage/sqlstorage/accounts.go	84.03% <0.00%> (-1.69%)	⬇️

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