docs: shorten the gt guides

Cover what users need to get going and leave the details to
gt <command> --help and gt help.

Signed-off-by: bircni <[email protected]>
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# Gitea CLI
[gt](https://gitea.com/gitea/cli) is the official command line client for Gitea.
It works with repositories, issues, pull requests, releases, Actions workflows and runs,
packages, and the other resources of a Gitea instance, from a terminal or from a script.
[gt](https://gitea.com/gitea/cli) is the official command line client for Gitea. It works
with repositories, issues, pull requests, releases, Actions and the other resources of a
Gitea instance, from a terminal or a script.
:::info Development version
These pages describe builds from the `main` branch of gitea/cli, published as `nightly`
binaries and images.
These pages describe builds from the `main` branch of gitea/cli.
:::
## Requirements
- Gitea 28 or later. gt does not support older instances.
- Git on the `PATH`, for the commands that clone, check out or push, such as
`gt repo clone` and `gt pr checkout`.
gt needs Gitea 28 or later, and Git for the commands that clone, check out or push.
## Getting started
1. [Install gt](installation.md).
2. [Log in](authentication.md) to your Gitea instance:
2. [Log in](authentication.md):
```bash
gt auth login
```
3. Run commands from a clone of a repository on that instance. gt finds the repository
and the instance from the Git remotes:
3. Run commands in a clone of a repository on that instance, or select one with `--repo`:
```bash
gt issue list --label bug
gt pr checkout 13
gt pr checks --watch
```
Outside a clone, select the repository with `--repo` (`-R`), as `OWNER/REPO` or as a URL:
```bash
gt issue view 42 --repo gitea.com/gitea/cli
```
`gt doctor` checks the setup that commands in the current directory use: the settings
files, the instance, the account and its credential, the repository, and Git. Each
problem it reports comes with the command that fixes it.
`gt doctor` checks your setup and suggests a fix for each problem it finds.
## Commands
Commands are a noun followed by a verb, such as `gt issue list` or `gt pr create`.
Every command has a `--help` page, which is also part of the
[command reference](reference/index.md). Besides the commands, gt has three help topics:
- `gt help environment`: global flags, environment variables, and how gt selects the
instance and the repository
- `gt help formatting`: JSON output with `--json` and `--jq`
- `gt help exit-codes`: the exit codes
For scripts and CI, read [Using gt in CI](ci.md) and [Output and scripting](scripting.md).
Every command documents itself with `--help`. `gt help environment`, `gt help formatting`
and `gt help exit-codes` cover global flags and environment variables, JSON output, and
exit codes.