[WIP] Dev documentation fixes

[luizirber]

TODO

• Clarifications about tox -e dev (how to activate environment)
  • tox.ini
  • Developer docs
• You only need one of the suggested envs, not all of them (mamba + nix + rustup/virtualenv)

Covers some of the discussions in #1375

[codecov]

Codecov Report

Merging #1522 (b4558c1) into latest (4c48f39) will increase coverage by 5.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           latest    #1522      +/-   ##
==========================================
+ Coverage   90.24%   95.27%   +5.02%     
==========================================
  Files         126       99      -27     
  Lines       21105    17405    -3700     
  Branches     1589     1589              
==========================================
- Hits        19047    16583    -2464     
+ Misses       1829      593    -1236     
  Partials      229      229              

Flag	Coverage Δ
python	95.27% <ø> (ø)
rust	?

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Impacted Files	Coverage Δ
src/core/src/cmd.rs
src/core/src/lib.rs
src/core/tests/test.rs
src/core/src/ffi/cmd/compute.rs
src/core/src/ffi/mod.rs
src/core/src/index/mod.rs
src/core/src/index/linear.rs
src/core/tests/minhash.rs
src/core/src/sketch/minhash.rs
src/core/src/ffi/hyperloglog.rs
... and 17 more

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