Update stalebot options and funding url (#135)

* Update stale.yml

* Update funding.yml

* Update to tag with meta-stable label

* Removed extra https in funding url

.github/FUNDING.yml

@@ -1 +1 @@
-custom: https://gitcoin.co/grants/79/lodestar-eth20-client
+custom: https://gitcoin.co/grants/6034/lodestar-typescript-ethereum-consensus-client

.github/stale.yml

@@ -12,18 +12,17 @@ onlyLabels: []
 
 # Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
 exemptLabels:
-   - "PR state: on-ice"
+  - "Epic"
-   - "Good First Issue"
+  - "meta-good-first-issue"
-   - "Status: On Ice"
+  - "meta-help-wanted"
-   - "Priority: 4 - Low"
+  - "meta-discussion"
-   - "Priority: 3 - Medium"
+  - "meta-pm"
-   - "Priority: 2 - High"
+  - "prio-critical"
-   - "Priority: 1 - Critical"
+  - "prio-high"
-   - "discussion"
+  - "prio-medium"
-   - "Discussion"
+  - "prio-low"
-   - "Epic"
+  - "status-blocked"
-   - "Good First Issue"
+  - "status-do-not-merge"
-   - "help wanted"
 
 # Set to true to ignore issues in a project (defaults to false)
 exemptProjects: false
@@ -35,7 +34,7 @@ exemptMilestones: true
 exemptAssignees: true
 
 # Label to use when marking as stale
-staleLabel: bot:stale
+staleLabel: meta-stale
 
 # Comment to post when marking as stale. Set to `false` to disable
 markComment: >