[README] update readme with TOML

Also, set gargantext-settings.toml as the default file
4 jobs for 304-dev-toml-config-rewrite in 83 minutes and 4 seconds (queued for 64 minutes and 50 seconds)
Status Job ID Name Coverage
  Cabal
passed #14619
cabal

00:37:44

 
  Stack
passed #14620
stack

00:09:09

 
  Bench
manual #14621
allowed to fail manual
bench
 
  Test
failed #14622
test

00:36:11

 
Name Stage Failure
failed
test Test
[39 of 44] Compiling Test.Ngrams.Query ( test/Test/Ngrams/Query.hs, /builds/gargantext/haskell-gargantext/dist-newstyle/build/x86_64-linux/ghc-9.4.7/gargantext-0.0.7.2.1/t/garg-test-tasty/opt/build/garg-test-tasty/garg-test-tasty-tmp/Test/Ngrams/Query.o ) [HIE file is missing]
[42 of 44] Compiling Test.Utils.Crypto ( test/Test/Utils/Crypto.hs, /builds/gargantext/haskell-gargantext/dist-newstyle/build/x86_64-linux/ghc-9.4.7/gargantext-0.0.7.2.1/t/garg-test-tasty/opt/build/garg-test-tasty/garg-test-tasty-tmp/Test/Utils/Crypto.o ) [HIE file is missing]
[43 of 44] Compiling Test.Utils.Jobs ( test/Test/Utils/Jobs.hs, /builds/gargantext/haskell-gargantext/dist-newstyle/build/x86_64-linux/ghc-9.4.7/gargantext-0.0.7.2.1/t/garg-test-tasty/opt/build/garg-test-tasty/garg-test-tasty-tmp/Test/Utils/Jobs.o ) [HIE file is missing]
[44 of 44] Compiling Main ( test/drivers/tasty/Main.hs, /builds/gargantext/haskell-gargantext/dist-newstyle/build/x86_64-linux/ghc-9.4.7/gargantext-0.0.7.2.1/t/garg-test-tasty/opt/build/garg-test-tasty/garg-test-tasty-tmp/Main.o ) [HIE file is missing]
Error: cabal: Failed to build test:garg-test-hspec from gargantext-0.0.7.2.1.
Failed to build test:garg-test-tasty from gargantext-0.0.7.2.1.

Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1