Remove adding myself as a Bcc to emails, I don’t need that with mu4e

Shortcuts for opening files are now generated from org tables.

Added some blacklisted directories to Projectile

Wrote a function to make my code clearer with `add-to-list'

Updated Org Capture shortcuts, in particular the text displayed in the
user interface while entering the shortcuts.

Several layouts changed with the Menu key was too much of a pain in
the back, so the only default layout now is the bépo layout

The `meson-mode` package is removed from my custom package list with
the addition of the `meson` layer in Spacemacs.

The `org` layer’s support for Trello is also removed from my
configuration while the support for Hugo is added.

The `c-c++` layer now uses `clangd` as its LSP backend instead of ccls

The `haskell` layer is removed from my configuration

Since it is now broken, instructions for installing a custom `mu`
package on Arch Linux that still enables it has been removed. I will
now use the default `mu` package from the AUR.

The Rust configuration has been updated with some additional
instructions on the reason why some elements are set, and how to
install these. The Rust LSP backend will now use the command `cargo
clippy` instead of `cargo check` to catch errors and warnings.

See https://blog.phundrak.com/better-custom-ids-orgmode/