Introductory guide for newcomers. This is a two-file quickstart that
shows a simple example to create a task and a pipeline.

These tutorials do not include new information. The information here is
reorganized to be easier to understand for newcomers. Including
prescritpive steps that the user just has to copy/paste .

Signed-off-by: NVille Aikas <vaikas@chainguard.dev>

Signed-off-by: Nshaowenchen <mail@chenshaowen.com>

Fedora 30-32 are no longer supported, updated info for releases currently available at https://copr.fedorainfracloud.org/coprs/chmouel/tektoncd-cli/

Changing links to any reference to tektoncd/pipeline.
Signed-off-by: NVincent Demeester <vdemeest@redhat.com>

Replace apt install for dpkg -i

dpkg/rpm is used when installing TektonCD CLI from package and apt/dnf when installing from a repository.

Uses curl -LO (instead of wget) as it is used later in the same page to get the LINK-TO-TARBALL.

Update links to the Katacoda tutorials to point to the official versions
at https://katacoda.com/tektoncd and update the dashboard scenario naming
to be consistent with other (i.e. drop the redundant `tekton-` from the
name + URL).

Instead, assume a cluster already exists, or briefly document using
`kind` to set up a local cluster for testing.

without --dry-run=client option, the create & replace command will fail.

- Added a second task creation
- Added a pipeline example
- Added links back and forth from the page
Signed-off-by: NJJ Asghar <jjasghar@gmail.com>
Signed-off-by: NPaul Czarkowski <username.taken@gmail.com>
Co-authored-by: NPaul Czarkowski <username.taken@gmail.com>

Changed `name` to `generateName` because of the behavior of the `--dry-run` of `tkn`.
Changed the `tkn` command for the logs at the end, because of the `generateName` is different per run.
Signed-off-by: NJJ Asghar <jjasghar@gmail.com>
Signed-off-by: NPaul Czarkowski <username.taken@gmail.com>

Changed from `apply` to `create` due to the declarative nature of `apply`. You can not use `generateName` with `apply`.
The error that happens is:

```
❯ kubectl apply -f taskRun.yml
error: error when retrieving current configuration of:
Resource: "tekton.dev/v1beta1, Resource=taskruns", GroupVersionKind: "tekton.dev/v1beta1, Kind=TaskRun"
Name: "", Namespace: "hello-world-pipeline"
from server for: "taskRun.yml": resource name may not be empty
```
The following is the correct behavior. 
```
❯ kubectl create -f taskRun.yml
taskrun.tekton.dev/echo-run-c5dtm created
```
Please look at:  https://github.com/kubernetes/kubernetes/issues/44501#issuecomment-294255660Signed-off-by: NJJ Asghar <jjasghar@gmail.com>

- Include tkn task start and --dry-run
- Reword portions of the section

Found two more instances of 
apiVersion: v1alpha1
in the Getting Started page. Updated those to use
apiVersion: v1beta1

Added a mention to use no.tags