tlmgr-platform, tlmgr-arch: add page (#6561)

pages/common/tlmgr-arch.md

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+# tlmgr arch
+
+> This command is an alias of `tlmgr platform`.
+> More information: <https://www.tug.org/texlive/tlmgr.html>.
+
+- View documentation for the original command:
+
+`tldr tlmgr platform`

pages/common/tlmgr-platform.md

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+# tldr platform
+
+> Manage TeX Live platforms.
+> More information: <https://www.tug.org/texlive/tlmgr.html>.
+
+- List all available platforms in the package repository:
+
+`tlmgr platform list`
+
+- Add the executables for a specific platform:
+
+`sudo tlmgr platform add {{platform}}`
+
+- Remove the executables for a specific platform:
+
+`sudo tlmgr platform remove {{platform}}`
+
+- Auto-detect and switch to the current platform:
+
+`sudo tlmgr platform set {{auto}}`
+
+- Switch to a specific platform:
+
+`sudo tlmgr platform set {{platform}}`