Fix table widths in lecture overview

Quarto derives the relative cell widths from the number of dashes in
the line separating the table header from the table body [0].
As a consequence, the date column was very thin causing line breaks.

This commit completely removes all efforts to make the table look nice
in ASCII in favor of a proper rendering as well as easier editing.

[0] https://quarto.org/docs/authoring/tables.html#column-widths

index.qmd

@@ -10,22 +10,22 @@ If not, don't worry, the lecture will be in a computer room.
 :::
 
 ## Lectures
-| Date       | Title                                                                | Lecturers |
-| ---------- | ---------------------------------------------------------------------------- | ------------------------------------------------------------------------- |
-| 2024-04-02 | The command line                                                             | Lukas, Flo |
-| 2024-04-09 | GIT                                                                          | Georgiana, Lukas |
-| 2024-04-16 | Programming paradigms                                                        | Claudia, Georgiana      |
-| 2024-04-23 | Data structures                                                        | Kalle, Dominik |
-| 2024-04-30 | Complexity                                                           | Tobi, Dominik |
+| Date | Title | Lecturers |
+| --- | --- | --- |
+| 2024-04-02 | The command line | Lukas, Flo |
+| 2024-04-09 | GIT | Georgiana, Lukas |
+| 2024-04-16 | Programming paradigms | Claudia, Georgiana |
+| 2024-04-23 | Data structures | Kalle, Dominik |
+| 2024-04-30 | Complexity | Tobi, Dominik |
 | 2024-05-07 | Debugging Strategies| Dominik, Rene |
 | 2024-05-14 | Good scientific & coding practice | Bjorn, Theresa|
-| [2024-05-21]{.inactive} | User experience design                                                              | Theresa, Flo |
-| 2024-05-28 | Testing                                               | Nils, René |
-| 2024-06-04 | Git advanced  | Tobi, Nils |
+| [2024-05-21]{.inactive} | User experience design | Theresa, Flo |
+| 2024-05-28 | Testing | Nils, René |
+| 2024-06-04 | Git advanced | Tobi, Nils |
 | 2024-06-11 | Parallelism | Georgiana, Claudia, JFE |
 | 2024-06-18 | Computing devices (hardware) | JFE, Claudia, Georgiana |
-| 2024-06-25 | File & Data systems    | Flo, Kalle |
+| 2024-06-25 | File & Data systems | Flo, Kalle |
 | 2024-07-02 | Memory hierarchies | Domink, JFE |
-| 2024-07-09 | Student talks for improving grades  |(tbd)|
+| 2024-07-09 | Student talks for improving grades | (tbd) |
 
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