Doc: Update setup documents (#4680)

* Doc: Update setup documents

Use GitHub api to checkout latest release instead of "git tag" command
which cannot accurately determine prerelease tag.
Also, Changed numbered list format because
the shell command is too long to fit on one line.

* Doc: Use tab instead of spaces

* Doc: Use master branch as latest release tag

master branch and latest release is the same.
master branch merges develop branch with each latest release.

1 files changed, 53 insertions, 28 deletions

diff --git a/docs/setup.en.md b/docs/setup.en.md
index 45e3e2c68b..b38ef64a02 100644
--- a/docs/setup.en.md
+++ b/docs/setup.en.md
@@ -32,15 +32,32 @@ Please install and setup these softwares:
 
 *3.* Install Misskey
 ----------------------------------------------------------------
-1. `su - misskey` Connect to misskey user.
-2. `git clone -b master git://github.com/syuilo/misskey.git` Clone the misskey repo from master branch.
-3. `cd misskey` Navigate to misskey directory
-4. `git checkout $(git tag -l | grep -Ev -- '-(rc|alpha)\.[0-9]+$' | sort -V | tail -n 1)` Checkout to the [latest release](https://github.com/syuilo/misskey/releases/latest)
-5. `npm install` Install misskey dependencies.
+1. Connect to misskey user.
+
+	`su - misskey`
+
+2. Clone the misskey repo from master branch.
+
+	`git clone -b master git://github.com/syuilo/misskey.git`
+
+3. Navigate to misskey directory
+
+	`cd misskey`
+
+4. Checkout to the [latest release](https://github.com/syuilo/misskey/releases/latest)
+
+	`git checkout master`
+
+5. Install misskey dependencies.
+
+	`npm install`
 
 *4.* Configure Misskey
 ----------------------------------------------------------------
-1. `cp .config/example.yml .config/default.yml` Copy the `.config/example.yml` and rename it to `default.yml`.
+1. Copy the `.config/example.yml` and rename it to `default.yml`.
+
+	`cp .config/example.yml .config/default.yml`
+
 2. Edit `default.yml`
 
 *5.* Build Misskey
@@ -74,37 +91,45 @@ Just `NODE_ENV=production npm start`. GLHF!
 
 ### Launch with systemd
 
-1. Create a systemd service here: `/etc/systemd/system/misskey.service`
+1. Create a systemd service here
+
+	`/etc/systemd/system/misskey.service`
+
 2. Edit it, and paste this and save:
 
-```
-[Unit]
-Description=Misskey daemon
+	```
+	[Unit]
+	Description=Misskey daemon
 
-[Service]
-Type=simple
-User=misskey
-ExecStart=/usr/bin/npm start
-WorkingDirectory=/home/misskey/misskey
-Environment="NODE_ENV=production"
-TimeoutSec=60
-StandardOutput=syslog
-StandardError=syslog
-SyslogIdentifier=misskey
-Restart=always
+	[Service]
+	Type=simple
+	User=misskey
+	ExecStart=/usr/bin/npm start
+	WorkingDirectory=/home/misskey/misskey
+	Environment="NODE_ENV=production"
+	TimeoutSec=60
+	StandardOutput=syslog
+	StandardError=syslog
+	SyslogIdentifier=misskey
+	Restart=always
 
-[Install]
-WantedBy=multi-user.target
-```
+	[Install]
+	WantedBy=multi-user.target
+	```
+
+3. Reload systemd and enable the misskey service.
+
+	`systemctl daemon-reload ; systemctl enable misskey`
+
+4. Start the misskey service.
 
-3. `systemctl daemon-reload ; systemctl enable misskey` Reload systemd and enable the misskey service.
-4. `systemctl start misskey` Start the misskey service.
+	`systemctl start misskey`
 
 You can check if the service is running with `systemctl status misskey`.
 
 ### How to update your Misskey server to the latest version
-1. `git fetch`
-2. `git checkout $(git tag -l | grep -Ev -- '-(rc|alpha)\.[0-9]+$' | sort -V | tail -n 1)`
+1. `git checkout master`
+2. `git pull`
 3. `npm install`
 4. `NODE_ENV=production npm run build`
 5. Check [ChangeLog](../CHANGELOG.md) for migration information