fix(package_index): Use HTTPS paths for all links

The package index uses secure HTTPS links to all resources, but still
uses an unsecure HTTP link for the help online URL. Fix this.

Signed-off-by: Luca Burelli <[email protected]>

Author: pillo79

package/package_esp32_index.template.json

@@ -6,7 +6,7 @@
       "websiteURL": "https://github.com/espressif/arduino-esp32",
       "email": "[email protected]",
       "help": {
-        "online": "http://esp32.com"
+        "online": "https://esp32.com"
       },
       "platforms": [
         {