Update docs to say 2.2

Reviewers: Jason Gustafson <jason@confluent.io>, Bill Bejeck <bbejeck@gmail.com>

The documentation version of 2.1.0 RC1 is still at 2.0. Updated it to 2.1.

Author: Vahid Hashemian <vahidhashemian@us.ibm.com>

Reviewers: Dong Lin <lindong28@gmail.com>

Closes #5916 from vahidhashemian/minor/update_version_in_documentation_for_2.1.0

Reviewers: Damian Guy <damian.guy@gmail.com>

Reviewers: Guozhang Wang <wangguoz@gmail.com>

1. Update the Streams hello world examples with the new API.
2. Update the version references in various places.
3. Update version templates to 1.1.x.

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Ismael Juma <ismael@juma.me.uk>, Damian Guy <damian.guy@gmail.com>, Derrick Or <derrickor@gmail.com>

Closes #4169 from guozhangwang/KMINOR-streams-docs

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Apurva Mehta <apurva@confluent.io>, Matthias J. Sax <matthias@confluent.io>, Jason Gustafson <jason@confluent.io>

Closes #3345 from guozhangwang/KMinor-streams-eos-docs

- Show AdminClient configs in the docs.
- Update Javadoc config so that public classes exposed by
the AdminClient are included.
- Version and table of contents fixes.

Author: Ismael Juma <ismael@juma.me.uk>

Reviewers: Colin Mccabe, Gwen Shapira

Closes #3271 from ijuma/kafka-5411-admin-client-javadoc-configs

1. Added an architecture section.
2. Added a configuration / execution sub-section to developer guide.

Minor tweaks and a bunch of missing fixes from `kafka-site` repo.

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Matthias J. Sax <matthias@confluent.io>, Derrick Or <derrickor@gmail.com>, Ewen Cheslack-Postava <ewen@confluent.io>

Closes #2488 from guozhangwang/KMinor-streams-docs-second-pass

Author: Ewen Cheslack-Postava <me@ewencp.org>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #2480 from ewencp/docs-version-0.10.2.0

- Seperate Streams documentation out to a standalone page.
- Setup templates to use handlebars.js
- Create template variables to swap in frequently updated values like version number from a single file templateData.js

Author: Derrick Or <derrickor@gmail.com>

Reviewers: Guozhang Wang <wangguoz@gmail.com>

Closes #2245 from derrickdoo/docTemplates

Removed a non-existing reference in table of contents and fixed some section numbers.

Author: Vahid Hashemian <vahidhashemian@us.ibm.com>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #2004 from vahidhashemian/doc/fix_toc

Make the latest version of our docs follow the latest site template structure.

Author: Derrick Or <derrickor@gmail.com>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #2003 from derrickdoo/docs-updates

Author: Gwen Shapira <cshapi@gmail.com>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #1966 from gwenshap/KAFKA-4244

This is to imply that the Java consumer/producer are the recommended consumer/producer now.

Author: Vahid Hashemian <vahidhashemian@us.ibm.com>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #1921 from vahidhashemian/KAFKA-3697

MINOR: Improve introduction section in docs to better cover connect and streams. Make uses and ecosystem pages stand alone.

Include a few clean-ups (also in producer section), mention deprecation plans and reorder so that the new consumer documentation is before the old consumers.

Author: Ismael Juma <ismael@juma.me.uk>

Reviewers: Jason Gustafson <jason@confluent.io>

Closes #1880 from ijuma/remove-beta-from-new-consumer-documentation

added new consumer metrics section
refactored common metrics into new section
updated TOC

Author: Kaufman Ng <kaufman@confluent.io>

Reviewers: Jason Gustafson <jason@confluent.io>, Ewen Cheslack-Postava <ewen@confluent.io>

Closes #1361 from coughman/KAFKA-3479-consumer-metrics-doc

Author: Ismael Juma <ismael@juma.me.uk>

Reviewers: Gwen Shapira

Closes #1423 from ijuma/minor-doc-fixes

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Michael G. Noll <michael@confluent.io>, Ismael Juma <ismael@juma.me.uk>

Closes #1321 from guozhangwang/KStreamsJavaDoc

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Gwen Shapira

Closes #1127 from guozhangwang/KStreamsDocs

This will need to be double-committed.

Author: Gwen Shapira <cshapi@gmail.com>

Reviewers: Ismael Juma <ismael@juma.me.uk>, Ewen Cheslack-Postava <ewen@confluent.io>

Closes #1107 from gwenshap/fix-doc-version

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Gwen Shapira

Closes #584 from guozhangwang/K2881

Often it is useful to link to a specific header within the documentation. Especially when referencing docs in the mailing lists.

This adds anchors and links for all headers in the docs.

Author: Grant Henke <granthenke@gmail.com>

Reviewers: Jun Rao <junrao@gmail.com>

Closes #498 from granthenke/doc-links

Author: Gwen Shapira <cshapi@gmail.com>

Reviewers: Jun Rao, Guozhang Wang

Closes #491 from gwenshap/KAFKA-2790

Author: Ewen Cheslack-Postava <me@ewencp.org>

Reviewers: Gwen Shapira

Closes #475 from ewencp/kafka-2379-connect-docs

Author: Guozhang Wang <wangguoz@gmail.com>

Reviewers: Gwen Shapira

Closes #468 from guozhangwang/WikiUpdate

Author: Grant Henke <granthenke@gmail.com>

Reviewers: Gwen Shapira

Closes #466 from granthenke/drop-contrib

…the way we always planned to

Author: Gwen Shapira <cshapi@gmail.com>

Reviewers: Jun Rao, Guozhang Wang

Closes #382 from gwenshap/KAFKA-2666

… info from the wiki

Author: Gwen Shapira <cshapi@gmail.com>

Reviewers: Sriharsha Chintalapani, Jun Rao

Closes #401 from gwenshap/KAFKA-2681

…s for 0.9.0

Author: Grant Henke <granthenke@gmail.com>

Reviewers: Gwen Shapira, Guozhang Wang

Closes #337 from granthenke/docs

This PR copies the latest kafka docs to kafka repo docs directory. Here I have copied 0.8.3/ directory contents from svn website repo to kafka/docs repository.

Some questions: This PR contains generated javadocs also.  Do we need to copy javadocs here?

Author: Manikumar reddy O <manikumar.reddy@gmail.com>

Reviewers: Gwen Shapira, Ismael Juma

Closes #171 from omkreddy/KAFKA-2425-MOVE-DOCS-TO-KAFKA-REPO