github: Update issue templates (syncthing#6610)

* github: Update issue templates

* wip

* wip

.github/ISSUE_TEMPLATE/01-feature.md

@@ -0,0 +1,13 @@
+---
+name: Feature request
+about: If you're just not sure how to do something, see "ask a question".
+labels: enhancement, needs-triage
+---
+
+### Include required information
+
+Please be sure to include at least:
+
+ - what problem your new feature would solve
+ - how or why you think it is generally useful (i.e., not just for you)
+ - what alternatives or workarounds you considered

.github/ISSUE_TEMPLATE/02-bug.md

@@ -0,0 +1,23 @@
+---
+name: Bug report
+about: If you're actually looking for support, see "ask a question".
+labels: bug, needs-triage
+---
+
+### Does your log mention database corruption?
+
+If your Syncthing log reports panics because of database corruption it is
+most likely a fault with your system's storage or memory. Affected log
+entries will contain lines starting with `panic: leveldb`. You will need to
+delete the index database to clear this, by running `syncthing
+-reset-database`.
+
+### Include required information
+
+Please be sure to include at least:
+
+ - which version of Syncthing and what operating system you are using
+ - browser and version, if applicable
+ - what happened,
+ - what you expected to happen instead, and
+ - any steps to reproduce the problem.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question
+    url: https://forum.syncthing.net/
+    about: Ask questions, get support, and discuss with other community members.
+  - name: Android issues
+    url: https://github.com/syncthing/syncthing-android/issues/
+    about: The Android app has its own issue tracker.

.github/SECURITY.md

@@ -1,48 +1,10 @@
 ## Reporting a Vulnerability
 
-If you believe that you've found a Syncthing-related security vulnerability, please report it by sending email to the address [email protected]. The PGP key for [email protected] (B683AD7B76CAB013) below can be used to send encrypted mail or to verify responses received from that address.
+If you believe that you've found a Syncthing-related security vulnerability,
+please report it by sending email to the address [email protected]. The
+[PGP key for [email protected]
+(B683AD7B76CAB013)](https://syncthing.net/security-key.txt) can be used to
+send encrypted mail or to verify responses received from that address.
 
-```
------BEGIN PGP PUBLIC KEY BLOCK-----
-Version: GnuPG v1
-
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-=No/v
------END PGP PUBLIC KEY BLOCK-----
-```
+You can read more about Syncthing security at
+https://syncthing.net/security/.