v0.2.0

feat: added TUI with Textual (#7)

* build: added Textual

* style: added ASCII logo

* feat: added Textual screen with header and footer; added menu handler

* chore: added missing init

* refactor: changed name of .tcss file

* feat: added ParamScreen and ExecutionScreen needed to execute any menu options

* style: changed color codes of logging levels to match official SAP color palettes

* refactor: added logic to start Textual app

* refactor: improved order

* refactor: removed old menu as it is not needed anymore

* style: changed comment

* fix: fixed log level CRITICAL not being displayed correctly

* style: added style to error message of the ExecutionScreen

* style: added additional log statement for more clarity

* style: changed hex code for errors

* feat: added editor to change the settings from the CLI

* refactor: changed globals to class attributes to enable reloading the config after editing the settings file

* refactor: changed naming convention of SETTINGS_FILE variable

* chore: added styles for the in-app settings editor

* build: bumped minor version

* build: moved textual-dev to dev dependency group

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Co-authored-by: Peter Schwips <p.schwips@nbb-netzgesellschaft.de>