Update peer-observer node block arrival times (& remove mermaid chart)

.github/workflows/qa.yml

@@ -18,5 +18,3 @@ jobs:
       run: ./qa/sanity-checks/sanity-check.sh
     - name: Block timestamp offset checks
       run: python3 qa/block-timestamps/check-block-timestamps.py
-    - name: Check gantt graph up-to-date
-      run: ./qa/data-availability/chech-graph-uptodate.sh

README.md

@@ -43,33 +43,3 @@ maintain a list of height and header timestamps in
 list might need to be updated. This can be done with the Bash script
 `qa/block-timestamps/update-block-timestamps.sh` requiring a Bitcoin Core
 instance with the REST server enabled.
-
-The following availability graph can be generated with the tool
-`qa/data-availability/gen-mermaid.py`. This should be updated when adding a
-new data source.
-
-```mermaid
-gantt
-dateFormat x
-title data availability (not showing potential per-source holes)
-todayMarker off
-
-0xb10c_peer-observer-frank: 1707523605000, 1764633510232
-0xb10c_peer-observer-charlie: 1707523605000, 1764633502435
-0xb10c_peer-observer-erin: 1707523606000, 1764633502410
-0xb10c_peer-observer-bob: 1707523605000, 1764633502292
-0xb10c_peer-observer-dave: 1707523606000, 1764633502266
-0xb10c_peer-observer-alice: 1707523605000, 1764633502241
-0xb10c_rs2: 1656356008000, 1727433209000
-vostrnad_node1: 1678416045000, 1702535282000
-n-thumann: 1669583939000, 1702072477000
-darosior_node0: 1676970378000, 1702022714000
-0xb10c_monitoring1: 1605513978094, 1701968604513
-KIT_monitorB: 1554813325167, 1701803016066
-KIT_monitor2: 1439645276225, 1701798709781
-KIT_monitor1: 1439476817617, 1701797554640
-0xb10c_memo: 1635945250000, 1666268995000
-offing-gcp: 1633117022000, 1639414560000
-0xb10c_memo-old: 1562848974000, 1605772694000
-
-```