remove Python package, drop Elasticsearch 1.0.3 support, get CI working again

[jameslamb]

Removes the Python package.

Based on offline conversations with @austin3dickey and @ngparas , we've decided to retire the Python package here and focus this repo only on the R package (https://cran.r-project.org/web/packages/uptasticsearch/index.html).

The Python package was never distributed via package managers and I don't think it's in use anywhere today.

Notes for Reviewers

Other changes to get CI working

Updating syntax for {lintr}

To fix stuff like this:

the use of linters of class 'function' was deprecated in lintr version 3.0.0. Use linters classed as 'linter' (see ?Linter) instead.

Skipping {lintr} checks that raise errors (I'll fix these in follow-up PRs).*

Dropping Elasticsearch 1.0.3 support

The Docker images we were using for that support can't run on newer versions of docker.

Elasticsearch version: 1.0.3
Starting up Elasticsearch...
Unable to find image 'barnybug/elasticsearch:1.0.3' locally
1.0.3: Pulling from barnybug/elasticsearch
docker: [DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of docker.io/barnybug/elasticsearch:1.0.3 to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/.
See 'docker run --help'.

(build link)

Seems ok... Elasticsearch 1.0.3 came out in April 2014 (link).

[jameslamb]

yay CI works again 🎉

All things considered... pretty cool that this is all it took after around 4 years of inactivity.

[austin3dickey]

nice!