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/gitv2/README.md

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+Consider putting related commands together, such as `push` and `pull`,
+to decide how to execute based on the current environment or specified parameters.
+
+This mode is more convenient,
+but more difficult to implement in traditional shells such as zsh.
+
+In nushell it's very easy.
+
+In this way, the commands that need to be memorized will be greatly reduced,
+and the parameters can be automatically completed.
+In the most common scenarios, it is even possible to omit the parameter.
+
+In contrast, the behavior of commands requires fine-tuning to be intuitive.
+(there may still be some unreasonable places that need to be adjusted)
+
+I tried to tidy part of it, and it is basically usable.
+(The goal is to organize all aliases to where they should go)
+
+### gs
+Git status and stash.
+
+### gl
+Git log and show.
+
+### gb
+About the branch.
+
+Create branch if it doesn't exist,
+switch otherwise (branch are automatically completed),
+use -d to delete.
+
+If there is no branch as an argument, the branch is displayed.
+
+### gp
+Pull, push and other related to remote repositories
+
+> We assume that the upstream and downstream branches keep the same name and do not operate across branches.
+
+- `--clone` to clone
+- `--submodule` submodule update and submodule init (with `--init`)
+- `--force` push --force (assume `pull --force` doesn't make sense)
+- `--init` git init
+- `--override` just used to trigger a github actions event (in fact, webhooks can also be used)
+- `--set-upstream` push --set-upstream
+- if branch is specified, it is `git fetch` (let's assume you don't like pulling from a different branch)
+- finally, if no branch and above parameters are specified
+    - `git pull` to update.
+    - if `ahead`, `git push` will be executed.
+
+### ga
+Git add, rm and restore. about files.
+
+Use `ga` because git add has the highest execution frequency,
+and `ga` is the most convenient input.
+
+- `--delete` git rm
+- `--restore` git restore
+- git add
+
+### gc
+Git commit
+
+### gd
+Git diff
+
+### gm
+Git merge and rebase
+
+- `--rebase` git rebase
+- git merge
+
+### gcp
+Git cherry-pick
+
+### gr
+Git reset
+
+### grmt
+Git remote
+
+### gbs
+Git bisect
+
+## changelog
+
+#### 2023-05-18
+- `gp -u` can omit branch
+- delete `grb`
+- improve the premise in the description