Update bug report templates, remove links to Spectrum (#1239)

.github/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,22 @@
+---
+name: Report a Bug
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Bug Description**
+A clear and concise description of what the bug is and how to reproduce it.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Browser (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Last upstream Slate commit (run `git log --author="Robert Lord" | head -n 1`):**
+Put the commit hash here

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Questions, Ideas, Discussions
+    url: https://github.com/slatedocs/slate/discussions
+    about: Ask and answer questions, and propose new features.

.github/ISSUE_TEMPLATE/start-here.md

@@ -1,27 +0,0 @@
----
-name: Start Here
-about: Help improve Slate!
-title: "✍️ TODO"
-labels: ''
-assignees: ''
-
----
-
-<!--
-⚠️  READ THIS BEFORE SUBMITTING ⚠️
-
-Thanks for submitting a bug to Slate! If you've got a question about how to implement some feature, are encountering some unusual behavior in your fork of Slate, or if you want to chat, please start a new thread in our Spectrum community here! I monitor it for new threads, and it makes it easy for knowledgeable members of the community to help solve problems.
-
--> https://spectrum.chat/slate <-
-
-If you've found a bug with Slate upstream that you're still encountering even in a lightly modified Slate, you're in the right place! Please fill out the form below with the issue you're having and we'll take a look. :)
--->
-
-Operating system: ✍️ TODO
-Last upstream commit (run `git log --author="Robert Lord" | head -n 1`): ✍️ TODO
-Browser version(s): ✍️ TODO
-Ruby version (run `ruby -v`):  ✍️ TODO
-
----
-
-✍️ TODO write your issue here