Simplify github issue templates; correct labels

If they're too long, people won't read them.
If they're too short, people won't know what to do.
If there are too many of them, people can't decide which to use.

Removed the question template because it's redundant with "open a blank
issue".

.github/ISSUE_TEMPLATE/feature_request.md

@@ -1,22 +1,19 @@
 ---
 name: Feature request
-about: Make suggestions for improving Doom Emacs
+about: It'd be cool if Doom did/had/would...
 labels: is:request
 title: "[REQUEST] "
 assignees: ''
 ---
 
 **Describe the feature**
-Start with a brief 1 or 2 sentence summary of feature.
-
-Then follow up with an extended explanation, if necessary. Here are some
-suggestions on what to include:
+- What is your request?
 - How is it helpful?
-- How is the feature used?
+- How is it used?
 - If the feature involves new plugins, include links to them
-- iF the feature involves replacement of current functionality, describe how the
-  new functionality is better.
-- If the feature is implemented in another editor Emacs distro:
+- If the feature involves replacement of current functionality, how the new
+  functionality is better?
+- If the feature is implemented in another editor or Emacs distro:
   - Include screenshots or screencasts of it
   - Include links to its implementation
   - Include names of commands (and not just the keybinds to invoke them)
@@ -25,4 +22,7 @@ suggestions on what to include:
 **System information**
 <details><pre>
 Include the output of `M-x doom/info` or `~/.emacs.d/bin/doom info` here.
+
+It's possible Doom already has the feature you're requesting. This will tell me
+why you aren't seeing it.
 </pre></details>