Signed-off-by: Nxiaolong.ran <rxl@apache.org>

### Modifications

- Add 2.6.1 release notes to repo

* Differentiate between source/sink/function operations

* Added release notes
Co-authored-by: NSanjeev Kulkarni <sanjeevk@splunk.com>

Add release notes for 2.5.2

### Motivation

* Update apache pulsar release 2.5.1 notes 

### Modifications

* Update apache pulsar release 2.5.1 notes 

* typo zookkeeper ==> zookeeper
* fix not match log

### Motivation

*A change that had to be moved to 2.5.0 (because it [changed the .proto file](https://github.com/apache/pulsar/pull/5230#issuecomment-555503228)), is still listed as having been done in 2.4.2 in the release notes.*

### Modifications

*Move the change from 2.4.2 to 2.5.0.*

*Motivation*

Add the release notes for 2.5.0 release

* [release][website] Add release notes for Release 2.4.2
Signed-off-by: Nxiaolong.ran <rxl@apache.org>

* add links for pull requests
Signed-off-by: Nxiaolong.ran <rxl@apache.org>

* fix comments
Signed-off-by: Nxiaolong.ran <rxl@apache.org>

* fix comments
Signed-off-by: Nxiaolong.ran <rxl@apache.org>

when release 2.4.1 leaked update latest version of website, this is to fix the error

release notes for 2.4.1

Added release notes for 2.4.0 release

* Update release notes for v2.3.2 release

* update release notes with links

* 2.3.0 release notes

* Update site2/website/release-notes.md
Co-Authored-By: Nmerlimat <mmerli@apache.org>

* Update site2/website/release-notes.md
Co-Authored-By: Nmerlimat <mmerli@apache.org>

* Update site2/website/release-notes.md
Co-Authored-By: Nmerlimat <mmerli@apache.org>

* Added Schema.KeyValue and Flink adaptor changes

* docs for 2.1.1-incubating release

* removing docs for sql

* [website] Fix a few broken links

 ### Changes

- missing hyperlink in `release-notes`
- add latest release in `release.json`
- fixing replace script since version already has `-incubating`

 ### NOTE

currently we have `releases.json` and `versions.json`. we should consolidate them in subsequent PRs

### Motivation

Improve the documentation and usability of the pulsar website. This moves the website and documentation to a new framework (https://docusaurus.io/)  which will make it easier to maintain going forward.

### Modifications

A new version of the website in site2 directory. Also updates the pulsar build docker to add the new website build dependencies.

### Result

A more usable website and documentation.

A preview of the site can be seen here: https://cckellogg.github.io/incubator-pulsar
*All the links and images might not work on this site since it's a test only site*

* Enable CRC32-C by default in BK client

* Added upgrade notes

* Added release notes for 2.0.1-incubating release`

* Fixed tag link

This enables people to easily link to release notes for specific versions. In the future, this page should be templated and built from source files rather than raw Markdown, but for now this provides an easy stopgap solution.