Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -23,3 +23,7 @@ Steps to reproduce the behaviour:
  - App Version:
  - Device: 
  - Android Version:
+
+**Logs/Screenshots:**
+<!-- Logs are very useful for debugging problems. This is optional if it's widely reproducible. -->
+<!-- For screenshots, please also provide browser screenshots if the preview differs from your browser -->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -10,3 +10,4 @@ assignees: AllanWang
 **Describe the feature**
 <!-- Note that Frost is limited by Facebook's mobile site -->
 <!-- Features relating to the web content are not always possible -->
+<!-- Frost is also in more of a maintenance state, so unless a feature fixes a key element or is widely desired, it likely won't be a priority -->

.github/ISSUE_TEMPLATE/theme-report.md

@@ -9,6 +9,7 @@ assignees: AllanWang
 
 **Description**
 <!-- Please describe the theme error, and how to get to the page-->
+<!-- If possible, provide the CSS; see https://allanwang.github.io/Frost-for-Facebook/docs/Theming -->
 
 **Details (please provide at least the app version):**
  - App Version: