Switch to urxvt terminal in order to provide a scrollable terminal. Scrolling
is convoluted in st [1], especially when used on a mobile device.
Scrolling is a basic need, e.g. to page through `dmesg` output.
[1] https://git.suckless.org/st/file/FAQ.html#l21
Save a few CPU cycles by dropping conky. Additionally, the existing config has
not been working for a long time now, and no one missed it.
For completeness, it was no longer displaying on the desktop. Manually starting
it showed:
```
conky: X Error: type 0 Display b5e73620 XID 1302 serial 97 error_code 10 request_code 2 minor_code 0 other Display: b5e73620
```
There are instructions [1] to resolve/workaround it, but we clearly do not have
a pressing need for conky to begin with.
[1] https://github.com/brndnmtthws/conky/issues/1443#issuecomment-1557793718
[ci:skip-build]: already built successfully in CI
- fix wifi signal quality display, since /proc/net/wireless is no longer
available in omap kernel
Suggested-by: DvaMishkiLapa <thesame.personal@gmail.com>
- add `polkit-elogind` so tools like `loginctl poweroff` and `nmtui` do not
require sudo under i3wm
[ci:skip-build]: already built successfully in CI
