Revert "Start of contributing, adding lock and stale (as per example from Juiceshop"

This reverts commit 897afa3c2b.

.github/lock.yml

@@ -1,10 +0,0 @@
----
-daysUntilLock: 365
-skipCreatedBefore: false
-exemptLabels: []
-lockLabel: false
-lockComment: >
-  This thread has been automatically locked because it has not had
-  recent activity after it was closed. :lock: Please open a new issue
-  for regressions or related bugs.
-setLockReason: false

.github/stale.yml

@@ -1,14 +0,0 @@
----
-daysUntilStale: 90
-daysUntilClose: 14
-exemptLabels:
-  - bounty
-  - challenge
-  - critical
-  - feature
-  - technical debt
-staleLabel: stale
-markComment: >
-  This issue has been automatically marked as `stale` because it has not had
-  recent activity. :calendar: It will be _closed automatically_ in one week if no further activity occurs.
-closeComment: false