Update cheatsheets

tldr/conda-init

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# conda init
+
+> Initialize conda for shell interaction.
+> Most shells need to be closed and restarted for changes to take effect.
+> More information: <https://docs.conda.io/projects/conda/en/latest/commands/init.html>.
+
+- Initialize a specific shell (if none is specified, defaults to `bash` for UNIX and `powershell` for Windows):
+
+`conda init {{zsh|bash|powershell|fish|tcsh|xonsh}}`
+
+- Initialize all available shells:
+
+`conda init --all`
+
+- Initialize conda for all users on the system:
+
+`conda init --system`
+
+- Don't initialize conda for the current user:
+
+`conda init --no-user`
+
+- Add `condabin/` directory to PATH:
+
+`conda init --condabin`
+
+- Undo effects of the last `conda init`:
+
+`conda init --reverse`