update

technology/applications/development/MongoDB.md

@@ -78,7 +78,6 @@ Usage:
 - `$and`: The `$and` operator performs a logical AND operation on an array of two or more expressions and selects the documents that satisfy all the expressions.
 - `$or`: The `$or` operator performs a logical OR operation on an array of two or more expressions and selects the documents that satisfy at least one of the expressions.
 - `$not`: The `$not` operator performs a logical NOT operation on the specified expression and selects the documents that do not match the expression.
-- `$exists`: The `$exists` operator matches documents where a specified field exists or does not exist.
 - `$type`: The `$type` operator matches documents where a specified field has a specific [BSON](files/BSON.md) type.
 - `$regex`: The `$regex` operator matches documents where a specified field matches a [regular expression](tools/Regex.md).
 - `$text`: The `$text` operator performs a text search on the specified field(s).

technology/applications/network/JDownloader.md

@@ -1,7 +1,7 @@
 ---
 obj: application
 flatpak-id: org.jdownloader.JDownloader
-website: http://www.jdownloader.org
+website: https://www.jdownloader.org
 ---
 # JDownloader
 JDownloader is a free, open-source download management tool with a huge community that makes downloading as easy and fast as it should be. Users can start, stop or pause downloads, set bandwith limitations, auto-extract archives and much more. JDownloader supports a bunch of sites with plugins.

technology/applications/office/LibreOffice.md

@@ -4,7 +4,7 @@ os:
   - linux
   - macos
   - windows
-website: http://www.libreoffice.org
+website: https://www.libreoffice.org
 flatpak-id: org.libreoffice.LibreOffice
 wiki: https://en.wikipedia.org/wiki/LibreOffice
 ---