Meta: Rename PR templates to be more descriptive in the GitHu UI (#2998)

* Rename PR templates to be more descriptive in the GitHu UI
* Remove currently-unused data block & extra heading from PR templates

.github/PULL_REQUEST_TEMPLATE/Accept or Reject a PEP.md

@@ -1,11 +1,3 @@
----
-name: Accept/Reject PEP
-about: Mark a draft Standards Track PEP as accepted or rejected
-title: "PEP NNN: Mark as Accepted"
----
-
-# Accept/Reject PEP
-
 <!--
 You can help complete the following checklist yourself if you like
 by ticking any boxes you're sure about, like this: [x]

.github/PULL_REQUEST_TEMPLATE/Infra or meta change.md

@@ -1,9 +1,5 @@
----
-name: Other
-about: Infra or meta change not falling in another category
----
-
 <!--
+This template is for an infra or meta change not belonging to another category.
 **Please** read our Contributing Guidelines (CONTRIBUTING.rst)
 to make sure this repo is the right place for your proposed change. Thanks!
 -->

.github/PULL_REQUEST_TEMPLATE/Mark a PEP Final.md

@@ -1,11 +1,3 @@
----
-name: Mark PEP Final
-about: Mark an Accepted Standards Track PEP as Final
-title: "PEP NNN: Mark Final"
----
-
-# Mark PEP Final
-
 <!--
 You can help complete the following checklist yourself if you like
 by ticking any boxes you're sure about, like this: [x]

.github/PULL_REQUEST_TEMPLATE/Modify an existing PEP.md

@@ -1,9 +1,3 @@
----
-name: Update/modify PEP
-about: Add to or change an existing PEP
-title: "PEP NNN: Description of change"
----
-
 <!--
 **Please** read our Contributing Guidelines (CONTRIBUTING.rst)
 to make sure this repo is the right place for your proposed change. Thanks!

.github/PULL_REQUEST_TEMPLATE/Propose a new PEP.md

@@ -1,12 +1,3 @@
----
-name: New PEP
-about: Submit a new draft PEP
-title: "PEP NNN: Title of PEP"
-labels: "new-pep"
----
-
-# New PEP
-
 <!--
 You can use the following checklist when double-checking your PEP,
 and you can help complete some of it yourself if you like