build: bump up version 0.15

Author: laysakura

versioned_docs/version-0.15/deployment/_category_.json

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+{
+  "label": "🚰 Deployment",
+  "position": 5
+}

versioned_docs/version-0.15/deployment/configuration.md

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+---
+sidebar_position: 2
+---
+
+# Configuration
+
+You can configure SpringQL in TOML format.
+
+Default values are used if you don't set the key-value in TOML.
+
+Here shows the default values and what they mean.
+
+```toml title="Default configuration values"
+[worker]
+# Number of generic worker threads. Generic worker threads deal with internal and sink tasks.
+# Setting this to > 1 may improve throughput but lead to out-of-order stream processing.
+n_generic_worker_threads = 1
+
+# Number of source worker threads. Source worker threads collect rows from foreign source.
+# Too many number may may cause row fraud in runtime.
+# Setting this to > 1 may improve throughput but lead to out-of-order stream processing.
+n_source_worker_threads = 1
+
+[memory]
+# How much memory is allowed to be used in SpringQL streaming runtime.
+upper_limit_bytes = 10_000_000
+
+# Percentage over `upper_limit_bytes` to transit from Moderate state to Severe.
+# In Severe state, internal scheduler is changed to exhibit memory-resilience.
+moderate_to_severe_percent = 60
+
+# Percentage over `upper_limit_bytes` to transit from Severe state to Critical.
+# In Critical state, all intermediate rows are purged to release memory.
+severe_to_critical_percent = 95
+
+critical_to_severe_percent = 80
+severe_to_moderate_percent = 40
+
+# Interval for MemoryStateMachineWorker to publish TransitPerformanceMetricsSummary event.
+memory_state_transition_interval_msec = 10
+
+# Interval for PerformanceMonitorWorker to publish ReportMetricsSummary event.
+performance_metrics_summary_report_interval_msec = 10
+
+[web_console]
+# Whether to enable POST API request to web console.
+enable_report_post = false
+
+report_interval_msec = 3_000
+
+host = "127.0.0.1"
+port = 8050
+
+timeout_msec = 3_000
+
+[source_reader]
+net_connect_timeout_msec = 1_000
+net_read_timeout_msec = 100
+
+[sink_writer]
+net_connect_timeout_msec = 1_000
+net_write_timeout_msec = 100
+```

versioned_docs/version-0.15/deployment/index.md

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+---
+sidebar_position: 1
+---
+
+# Introduction

versioned_docs/version-0.15/get-started/_category_.json

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+{
+  "label": "🏃 Get Started",
+  "position": 2
+}