chore(deps): bump ssri from 6.0.1 to 6.0.2

chore(deps): bump redis from 2.8.0 to 3.1.1

Bumps [redis](https://github.com/NodeRedis/node-redis) from 2.8.0 to 3.1.1.
- [Release notes](https://github.com/NodeRedis/node-redis/releases)
- [Changelog](https://github.com/NodeRedis/node-redis/blob/master/CHANGELOG.md)
- [Commits](https://github.com/NodeRedis/node-redis/compare/v.2.8.0...v3.1.1)

Signed-off-by: dependabot[bot] <support@github.com>

Bumps [ssri](https://github.com/npm/ssri) from 6.0.1 to 6.0.2.
- [Release notes](https://github.com/npm/ssri/releases)
- [Changelog](https://github.com/npm/ssri/blob/v6.0.2/CHANGELOG.md)
- [Commits](https://github.com/npm/ssri/compare/v6.0.1...v6.0.2)

Signed-off-by: dependabot[bot] <support@github.com>

Add direct links to docker files in README

Feature/frontend testing

1. Added JEST test support

2. Upgraded some dependencies (mainly typescript and eslint-typescript)

3. Replaced mocha with jest (as jest works better with TS)

4. Fixed .eslintrc to match the new eslint-typescript version

5. ADD two sample tests (footer.test.tsx and shortener.test.tsx)

Automatic multiplatform Docker images via GitHub Actions

chore(deps): bump axios from 0.19.1 to 0.21.1

Bumps [axios](https://github.com/axios/axios) from 0.19.1 to 0.21.1.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/0.19.1...v0.21.1)

Signed-off-by: dependabot[bot] <support@github.com>

chore(deps): bump y18n from 4.0.0 to 4.0.1

Bumps [y18n](https://github.com/yargs/y18n) from 4.0.0 to 4.0.1.
- [Release notes](https://github.com/yargs/y18n/releases)
- [Changelog](https://github.com/yargs/y18n/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yargs/y18n/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Add link to a simple BASH client with GUI

chore(deps): bump elliptic from 6.5.3 to 6.5.4

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.3 to 6.5.4.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.3...v6.5.4)

Signed-off-by: dependabot[bot] <support@github.com>

Add domain search

Add Gist link to a simple BASH function for the API

Resolves #383

Update mail.ts

* Update .docker.env

* Update .example.env

* Update .template.env

* Add a the documentation how to configure Kutt

* Added link to official docker hub image

* Fix typo