Changed . token to _dot

This change allows the dotfiles to work with chezmoi (e.g: on windows)
and improves grepability with neovim/telescope

dot_config/nushell/nu_scripts/modules/virtual_environments/README.md

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+# Virtual environment scripts
+
+The scripts in this directory activate virtual environments for Conda environments.
+
+## Usage
+
+The activation and deactivation commands are exported from the `conda` module.
+
+```
+> use conda.nu
+> conda activate foo
+[foo] > conda deactivate
+>
+```
+
+The `activate` command also includes custom completions for the environment names.
+To disable the prompt changes (e.g., to let [Starship](https://starship.rs) include its own), set the environment variable `CONDA_NO_PROMPT`.
+To set it globally, add the line `$env.CONDA_NO_PROMPT = true` to `$nu.config-path`.
+
+## Limitations
+
+_(old text, not tested)_
+
+- The "root_prefix" might not actually correspond to the correct path to the Conda envs. You can fix
+  this for your setup by changing how the root prefix is found in the `conda-env` command.
+- Nested envs are not well supported. If you activate a Conda env while another one is
+  activated, new elements will be appended to the PATH, but the other environment
+  variables will be overwritten. There's no way to then restore the PATH to the state
+  it was in before activating the *first* env (at least not with this script directly).