Restructure documentation. Now the documentation has installation, administration, usage, development, contributing the 5 main parts (#23629)

- **Installation**: includes how to install Gitea and related other
tools, also includes upgrade Gitea
- **Administration**: includes how to configure Gitea, customize Gitea
and manage Gitea instance out of Gitea admin UI
- **Usage**: includes how to use Gitea's functionalities. A sub
documentation is about packages, in future we could also include CI/CD
and others.
- **Development**: includes how to integrate with Gitea's API, how to
develop new features within Gitea
- **Contributing**: includes how to contribute code to Gitea
repositories.

After this is merged, I think we can have a sub-documentation of `Usage`
part named `Actions` to describe how to use Gitea actions

---------

Co-authored-by: John Olheiser <john.olheiser@gmail.com>

1 files changed, 0 insertions, 63 deletions

diff --git a/docs/content/doc/advanced/environment-variables.en-us.md b/docs/content/doc/advanced/environment-variables.en-us.md
deleted file mode 100644
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----
-date: "2017-04-08T11:34:00+02:00"
-title: "Environment variables"
-slug: "environment-variables"
-weight: 20
-toc: false
-draft: false
-menu:
-  sidebar:
-    parent: "advanced"
-    name: "Environment variables"
-    weight: 20
-    identifier: "environment-variables"
----
-
-# Environment variables
-
-**Table of Contents**
-
-{{< toc >}}
-
-This is an inventory of Gitea environment variables. They change Gitea behaviour.
-
-Initialize them before Gitea command to be effective, for example:
-
-```sh
-GITEA_CUSTOM=/home/gitea/custom ./gitea web
-```
-
-## From Go language
-
-As Gitea is written in Go, it uses some Go variables, such as:
-
-- `GOOS`
-- `GOARCH`
-- [`GOPATH`](https://golang.org/cmd/go/#hdr-GOPATH_environment_variable)
-
-For documentation about each of the variables available, refer to the
-[official Go documentation](https://golang.org/cmd/go/#hdr-Environment_variables).
-
-## Gitea files
-
-- `GITEA_WORK_DIR`: Absolute path of working directory.
-- `GITEA_CUSTOM`: Gitea uses `GITEA_WORK_DIR`/custom folder by default. Use this variable
-  to change _custom_ directory.
-- `GOGS_WORK_DIR`: Deprecated, use `GITEA_WORK_DIR`
-- `GOGS_CUSTOM`: Deprecated, use `GITEA_CUSTOM`
-
-## Operating system specifics
-
-- `USER`: System user that Gitea will run as. Used for some repository access strings.
-- `USERNAME`: if no `USER` found, Gitea will use `USERNAME`
-- `HOME`: User home directory path. The `USERPROFILE` environment variable is used in Windows.
-
-### Only on Windows
-
-- `USERPROFILE`: User home directory path. If empty, uses `HOMEDRIVE` + `HOMEPATH`
-- `HOMEDRIVE`: Main drive path used to access the home directory (C:)
-- `HOMEPATH`: Home relative path in the given home drive path
-
-## Miscellaneous
-
-- `SKIP_MINWINSVC`: If set to 1, do not run as a service on Windows.