Update install script

.gitignore

 working
+stickerpicker/

install.sh

 #!/bin/bash
 
+BASE_DIR="$PWD"
+
+die() {
+    error $*
+    cd $PWD # Go to initial directory
+    exit 1
+}
+
+error() {
+    echo -ne '\e[31m'$*'\e[39m\n'
+}
+
+warn() {
+    echo -ne '\e[33m'$*'\e[39m\n'
+}
+
+info() {
+    echo -ne '\e[32m'$*'\e[39m\n'
+}
+
 # Clone the stickerpicker into the html repository
-cd ~/html
-git clone https://github.com/maunium/stickerpicker.git
+cd ~/html >/dev/null 2>&1 \
+    || warn "Could not cd to '~/html', will clone to '$PWD/stickerpicker'"
+
+git clone https://github.com/maunium/stickerpicker.git stickerpicker \
+    || die "Failed to git clone the stickerpicker project." \
+           "If you already installed stickerpicker, remove it or use the 'stpkg' command"
 
 # Initialize the stickerpicker with the pack
 # scalar-privacy_pam.json
-cd stickerpicker
-mv packs/* web/packs
-cd web/packs
-touch index.json
-echo "{
-  \"homeserver_url\": \"https://matrix.iiens.net\",
-  \"packs\": [
-    \"scalar-privacy_pam.json\"
+cd stickerpicker        || die "Could not cd to '$PWD/stickerpicker'"
+mv packs/* web/packs    || die "Failed to cp packs to '$PWD/web/packs'"
+cd web/packs            || die "Failed to cd to '$PWD/web/packs'"
+
+cat > index.json << EOF
+{
+  "homeserver_url": "https://matrix.iiens.net",
+  "packs": [
+    "scalar-privacy_pam.json"
   ]
 }
-" >> index.json
-echo "Created index.json in ~/html/stickerpicker/web/packs"
+EOF
+
+[ ! -f index.json ] && die "Failed to create the $PWD/index.json file"
+
+info "Created index.json in '$PWD'"
+
+# Go to initial directory
+cd $BASE_DIR