clean up of the config options

Emojis are used to make the different options easier to distinguish

more refactoring on chat and embed model support

* differentiate between input and output tokens
* make use of much larger input contexts

add send button

Some people said they're not clear how to send messages, so a button was
added. Pressing Enter still works. The entry was changed to a textarea
making longer questions easier. Shift-

add send button

Some people said they're not clear how to send messages, so a button was
added. Pressing Enter still works. The entry was changed to a textarea
making longer questions easier. Shift-Enter can be used to add line
breaks. All button titles are now translatable.

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tell the model to fall back to current language if it's unsure

The model defaulted to spanish if no sources were found

Regular expressions to limit the indexed pages. Implements #5

Both regular expressions (when set) need to apply at the same time. Eg a
page MUST match the matchRegex and MUST NOT match the skipRegex

Regular expressions to limit the indexed pages. Implements #5

Both regular expressions (when set) need to apply at the same time. Eg a
page MUST match the matchRegex and MUST NOT match the skipRegex to be
applied.

The regular expressions are applied when running the `embed` command
line command. Pages no longer adhering to a changed regex setup will be
removed from the vector store.

For the sqlite storage it is recommended to re-cluster the index when
the reges are changed by running the `maintenance` command.

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Added Qdrant Storage

Added ChromaDB vector storage support

�� Automatic code style fixes

optionally search one language only

option to prefer a configured language instead of guessing

use a cut-off point when considering similar documents

refactoring to make models selectable

This makes it much easier to add new models. Models can now be selected
via the configuration

Use overlapping chunks, prepare for new models

allow to restrict access to certain users and groups

add optional conversation logging

This might be useful to debug and monitor the real world usage of the
bot and analyze abuse.

german translation and more styling adjustments

Check ACLs before using sources

support chatting

asking standalone question works

initial checkin. working vector storage and similarity search