fix(solus): update Solus URLs

The latest Solus release has changed the naming of ISOs:

- Update all related functions to support the ISO name
  format used in the latest release.
- Use the directory listings in order to support more releases in the future.

quickget

@@ -1006,12 +1006,12 @@ function releases_slitaz() {
 
 function releases_solus() {
     #shellcheck disable=SC2046,SC2005
-    echo $(web_pipe "https://getsol.us/download/" | grep "isos" | grep Download | cut -d'-' -f 2 | sort -ru)
+    echo $(web_pipe_json "https://downloads.getsol.us/isos/" | jq -r '.[].name[:-1]' | grep -E "^[0-9-]+$" | sort -u)
 }
 
 function editions_solus() {
     #shellcheck disable=SC2046,SC2005
-    echo $(web_pipe "https://getsol.us/download/" | grep "isos" | grep Download | cut -d'.' -f5 | cut -d'-' -f2- | sort -u)
+    echo $(web_pipe_json "https://downloads.getsol.us/isos/$(releases_solus | tail -n1)/" | jq -r '.[].name | sub("Solus-(?<e>.*)-Release-.*"; "\(.e)")' | sort -u)
 }
 
 function releases_sparkylinux() {
@@ -1184,6 +1184,11 @@ function web_pipe() {
     curl --silent --location "${1}"
 }
 
+# Download a JSON file from the web and pipe it to stdout
+function web_pipe_json() {
+     curl --silent --location --header "Accept: application/json" "${1}"
+}
+
 # Download a file from the web
 function web_get() {
     local CHECK=""
@@ -2461,7 +2466,7 @@ function get_slitaz() {
 
 function get_solus() {
     local HASH=""
-    local ISO="Solus-${RELEASE}-${EDITION}.iso"
+    local ISO="Solus-${EDITION}-Release-${RELEASE}.iso"
     local URL="https://downloads.getsol.us/isos/${RELEASE}"
     HASH=$(web_pipe "${URL}/${ISO}.sha256sum" | cut -d' ' -f1)
     echo "${URL}/${ISO} ${HASH}"