Update cheatsheets

tlmgr-gui

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# tlmgr gui
+
+> Start a graphical user interface for `tlmgr`.
+> `tlmgr gui` depends on the package `perl-tk`, which has to be installed manually.
+> More information: <https://www.tug.org/texlive/tlmgr.html>.
+
+- Start a GUI for `tlmgr`:
+
+`sudo tlmgr gui`
+
+- Start a GUI specifying the background color:
+
+`sudo tlmgr gui -background "{{#f39bc3}}"`
+
+- Start a GUI specifying the foreground color:
+
+`sudo tlmgr gui -foreground "{{#0ef3bd}}"`
+
+- Start a GUI specifying the font and font size:
+
+`sudo tlmgr gui -font "{{helvetica 18}}"`
+
+- Start a GUI setting a specific geometry:
+
+`sudo tlmgr gui -geometry {{width}}x{{height}}-{{xpos}}+{{ypos}}`
+
+- Start a GUI passing an arbitrary X resource string:
+
+`sudo tlmgr gui -xrm {{xresource}}`