refactor: many changes

- Add missing actions and make a clear boundary between actions,
  services and nfra (i.e: actions shouldn't use stuff from infra/)
- Delete stuff not in use: tts, gtts, etc
- Add a ton of tests

tests/test_models.py

@@ -0,0 +1,21 @@
+from tests.conftest import ChatbotFactory, QuoteFactory
+
+
+def test_chatbot_format_mods_from_string_validator(chatbot_factory: ChatbotFactory):
+    chatbot = chatbot_factory.build(mods="foo,bar")
+    assert chatbot.mods == ["foo", "bar"]
+
+
+def test_chatbot_mods_as_string_returns_empty_string(chatbot_factory: ChatbotFactory):
+    modsless_chatbot = chatbot_factory.build(mods=[])
+    assert modsless_chatbot.mods_as_string == ""
+
+
+def test_quote_as_pretty(quote_factory: QuoteFactory):
+    quote = quote_factory.build(quote="Foo", author="Bar")
+    assert quote.as_pretty() == "«Foo» - Bar"
+
+
+def test_quote_as_pretty_saved(quote_factory: QuoteFactory):
+    quote = quote_factory.build(quote="Foo", author="Bar")
+    assert quote.as_pretty_saved() == "He añadido la cita «Foo» de Bar"