Remove Elasticsearch from docker-compose

[maarcingebala]

We've decided to remove Elasticsearch from docker-compose in order to simplify the build on local machines. Elasticsearch is an optional dependency and should be configured manually if one needs to use it.

Fixes #3464

Pull Request Checklist

1. Privileged views and APIs are guarded by proper permission checks.
2. All visible strings are translated with proper context.
3. All data-formatting is locale-aware (dates, numbers, and so on).
4. Database queries are optimized and the number of queries is constant.
5. Database migration files are up to date.
6. The changes are tested.
7. The code is documented (docstrings, project documentation).
8. GraphQL schema and type definitions are up to date.
9. Changes are mentioned in the changelog.

[Pacu2]

Do we have docs on how to set up elastic search?

[maarcingebala]

@Pacu2 We recommend installing it in accordance with the official documentation.

[codecov]

Codecov Report

Merging #3482 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3482      +/-   ##
==========================================
- Coverage   89.87%   89.75%   -0.12%     
==========================================
  Files         241      237       -4     
  Lines       13103    12950     -153     
  Branches     1322     1313       -9     
==========================================
- Hits        11776    11623     -153     
  Misses        922      922              
  Partials      405      405

Impacted Files	Coverage Δ
saleor/payment/gateways/stripe/forms.py
saleor/payment/gateways/stripe/utils.py
saleor/payment/gateways/stripe/errors.py
saleor/payment/gateways/stripe/__init__.py

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