.github: simplify templates

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

.github/ISSUE_TEMPLATE.md

@@ -1,13 +1,2 @@
 
-
-<br>
-<br>
-**!!! PLEASE READ BEFORE REPORTING !!!**
-<br>
-<br>
-
-A good bug report has some very specific qualities, so please read over our short document on [reporting bugs][report_bugs] before submitting a bug report.
-
-To ask a question, go ahead and ignore this.
-
-[report_bugs]: https://github.com/coreos/etcd/blob/master/Documentation/reporting_bugs.md
+Please read https://github.com/coreos/etcd/blob/master/Documentation/reporting_bugs.md.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,11 +1,2 @@
 
-
-<br>
-<br>
-**!!! PLEASE READ BEFORE CONTRIBUTING !!!**
-<br>
-<br>
-
-Please read our [contribution workflow][contributing] before submitting a pull request.
-
-[contributing]: https://github.com/coreos/etcd/blob/master/CONTRIBUTING.md#contribution-flow
+Please read https://github.com/coreos/etcd/blob/master/CONTRIBUTING.md#contribution-flow.