chores-update readme/code cleanup/etc

[popduke]

1. update readme & the website url in starter output Add Discord link #148
2. remove an unused sys prop
3. update demo event logger to output resource warning

[coveralls]

Pull Request Test Coverage Report for Build 15962567996

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 39 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-0.01%) to 63.208%

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Files with Coverage Reduction	New Missed Lines	%
org/apache/bifromq/basecrdt/core/internal/CausalCRDTInflater.java	1	93.07%
org/apache/bifromq/inbox/server/InboxFetchPipeline.java	2	57.21%
org/apache/bifromq/basehlc/HLC.java	3	67.74%
org/apache/bifromq/basekv/raft/RaftNodeStateLeader.java	3	85.23%
org/apache/bifromq/demo/plugin/EventLogger.java	3	0.0%
org/apache/bifromq/basecluster/memberlist/AutoDropper.java	5	78.93%
org/apache/bifromq/basekv/raft/RaftNodeState.java	6	90.95%
org/apache/bifromq/basekv/raft/RaftNodeStateFollower.java	8	82.62%
org/apache/bifromq/dist/trie/TopicFilterIterator.java	8	71.37%

Totals
Change from base Build 15895416243:	-0.01%
Covered Lines:	23332
Relevant Lines:	35674

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💛 - Coveralls