help: grafana: migrate to new upstream

Ref to https://github.com/tuna/issues/issues/1637

help/_posts/2019-02-15-grafana.md

@@ -8,10 +8,10 @@ mirrorid: grafana
 
 ### Debian / Ubuntu 用户
 
-首先信任 https://packages.grafana.com/ 的 GPG 公钥:
+首先信任 https://apt.grafana.com/ 的 GPG 公钥:
 
 ```bash
-curl https://packages.grafana.com/gpg.key | sudo apt-key add -
+sudo wget -q -O /usr/share/keyrings/grafana.key https://apt.grafana.com/gpg.key
 ```
 
 确保你的 apt 支持 HTTPS:
@@ -47,7 +47,7 @@ sudo apt-get install grafana
 
 {% raw %}
 <script id="apt-template" type="x-tmpl-markup">
-deb https://{%endraw%}{{ site.hostname }}{%raw%}/grafana/apt/ {{release_name}} main
+deb [signed-by=/usr/share/keyrings/grafana.key] https://{%endraw%}{{ site.hostname }}{%raw%}/grafana/apt/ {{release_name}} main
 </script>
 {%endraw%}
 
@@ -55,22 +55,20 @@ deb https://{%endraw%}{{ site.hostname }}{%raw%}/grafana/apt/ {{release_name}} m
 ### Centos / Redhat 用户
 新建 `/etc/yum.repos.d/grafana.repo`，内容为
 
-<form class="form-inline">
-<div class="form-group">
-	<label>你的 Grafana 版本: </label>
-	<select class="form-control release-select" data-template="#yum-template" data-target="#yum-content">
-		<option data-release="rpm">Grafana Stable Repository</option>
-		<option data-release="rpm-beta">Grafana Beta Repository</option>
-	</select>
-</div>
-</form>
+```
+[grafana]
+name=grafana
+baseurl=https://{{ site.hostname }}/grafana/yum/rpm
+repo_gpgcheck=0
+enabled=1
+gpgcheck=0
+```
 
-<p></p>
-<pre>
-<code id="yum-content">
-</code>
-</pre>
+如果要避免安装 beta 版本，需要新增一行
 
+```
+exclude=*beta*
+```
 
 再执行
 
@@ -78,14 +76,3 @@ deb https://{%endraw%}{{ site.hostname }}{%raw%}/grafana/apt/ {{release_name}} m
 sudo yum makecache
 sudo yum install grafana
 ```
-
-{% raw %}
-<script id="yum-template" type="x-tmpl-markup">
-[grafana]
-name=grafana
-baseurl=https://{%endraw%}{{ site.hostname }}{%raw%}/grafana/yum/{{release_name}}
-repo_gpgcheck=0
-enabled=1
-gpgcheck=0
-</script>
-{% endraw %}