doc fix howto

docs/howto/howto.md

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+## Append text to a dotfile on install
+
+[Append text to a dotfile on install](append.md)
+
+## Create files on install
+
+[Create files on install](create-special-files.md)
+
+## Handle compressed directories
+
+[Store compressed directories](store-compressed-directories.md)
+
+## Handle secrets
+
+[Handle secrets](sensitive-dotfiles.md)
+
+## Handle special chars
+
+[Handle special chars](special-chars.md)
+
+## Improve git integration
+
+[Improve git integration](improve-git-integration.md)
+
+## Include file or template in template
+
+[Include file or template in template](include-in-template.md)
+
+## Manage system dotfiles
+
+[Manage system dotfiles](global-config-files.md)
+
+## Merge files on install
+
+[Merge files on install](merge-files-when-installing.md)
+
+## Share content across dotfiles
+
+[Share content across dotfiles](sharing-content.md)
+
+## Symlink dotfiles
+
+[Symlink dotfiles](symlink-dotfiles.md)