Improve EOSdash.

Make EOSdash use UI components from MonsterUI to ease further development.

- Add a first menu with some dummy pages and the configuration page.
- Make the configuration scrollable.
- Add markdown component that uses markdown-it-py (same as used by
  the myth-parser for documentation generation).
- Add bokeh (https://docs.bokeh.org/) component for charts
- Added several prediction charts to demo
- Add a footer that displays connection status with EOS server
- Add logo and favicon

Update EOS server:

- Move error message generation to extra module
- Use redirect instead of proxy

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

tests/test_server.py

@@ -9,6 +9,8 @@ import psutil
 import pytest
 import requests
 
+from akkudoktoreos.server.server import get_default_host
+
 DIR_TESTDATA = Path(__file__).absolute().parent.joinpath("testdata")
 
 FILE_TESTDATA_EOSSERVER_CONFIG_1 = DIR_TESTDATA.joinpath("eosserver_config_1.json")
@@ -235,12 +237,11 @@ class TestServerStartStop:
     def test_server_start_eosdash(self, tmpdir):
         """Test the EOSdash server startup from EOS."""
         # Do not use any fixture as this will make pytest the owner of the EOSdash port.
+        host = get_default_host()
         if os.name == "nt":
-            host = "localhost"
             # Windows does not provide SIGKILL
             sigkill = signal.SIGTERM
         else:
-            host = "0.0.0.0"
             sigkill = signal.SIGKILL
         port = 8503
         eosdash_port = 8504