Adds sources download information for all projects except Brave

_data/downloads.yml

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+- friendlyName: Zipkin Api
+  module: zipkin-api
+  version: 0.2.1
+  repo: zipkin-api
+- friendlyName: Zipkin Brave for Apache Cassandra
+  module: brave-cassandra
+  version: 0.10.2
+  repo: zipkin-brave-cassandra
+- friendlyName: Zipkin Brave for Apache Karaf
+  module: brave-karaf
+  version: 0.1.2
+  repo: zipkin-brave-karaf
+- friendlyName: Zipkin Dependencies
+  module: zipkin-dependencies
+  version: 2.2.0
+  repo: zipkin-dependencies
+- friendlyName: Zipkin Reporter Java
+  module: zipkin-reporter-java
+  version: 2.8.3
+  repo: zipkin-reporter-java
+- friendlyName: Zipkin Server and Core Library
+  module: zipkin
+  version: 2.14.0
+  repo: zipkin
+- friendlyName: Zipkin Layout Factory
+  module: zipkin-layout-factory
+  version: 0.0.5
+  repo: zipkin-layout-factory
+  type: internal

pages/downloads.md

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+---
+title: Source Downloads
+weight: 4
+---
+{% assign baseUrl = 'https://www.apache.org/dyn/closer.cgi?path=incubator/zipkin' %}
+{% assign downloads = site.data.downloads | where_exp: "download", "download.type != 'internal'" %}
+
+Apache Software Foundation (ASF) requires projects to have a downloads page, used in release announcements. Below are the locations of the official voted source releases per-project.
+
+If you like, you can [verify](https://www.apache.org/info/verification) the source downloads using Zipkin's [KEYS file](https://www.apache.org/dist/incubator/zipkin/KEYS).
+
+| Name | Version | Source | Signature | Checksum |
+|:---- |:--------|:-------|:----------|:-------- |{% for download in downloads %}{% capture zip %}{{ baseUrl }}/{{ download.module }}/{{ download.version }}/apache-{{ download.repo }}-incubating-{{ download.version }}-source-release.zip{% endcapture %}{% capture releaseNotes %}https://github.com/apache/incubator-{{ download.repo }}/releases/tag/v{{ download.version }}{% endcapture %}
+| {{ download.friendlyName }} | [{{ download.version }}]({{ releaseNotes }}) | [zip]({{ zip }}) | [asc]({{ zip }}.asc) | [sha512]({{ zip }}.sha512) |{% endfor %}
+{: .wide-table}
+
+### Internal Tools
+The following tools are not for general use, but are listed in order to comply with Apache Software Foundation (ASF) release policy.
+
+{% assign internalDownloads = site.data.downloads | where_exp: "download", "download.type == 'internal'" %}
+
+| Name | Version | Source | Signature | Checksum |
+|:---- |:--------|:-------|:----------|:-------- |{% for download in internalDownloads %}{% capture zip %}{{ baseUrl }}/{{ download.module }}/{{ download.version }}/apache-{{ download.repo }}-incubating-{{ download.version }}-source-release.zip{% endcapture %}{% capture releaseNotes %}https://github.com/apache/incubator-{{ download.repo }}/releases/tag/v{{ download.version }}{% endcapture %}
+| {{ download.friendlyName }} | [{{ download.version }}]({{ releaseNotes }}) | [zip]({{ zip }}) | [asc]({{ zip }}.asc) | [sha512]({{ zip }}.sha512) |{% endfor %}
+{: .wide-table}
+
+
+