chore(kb): add placeholders to the pile

knowledge base/changelog.placeholder

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+https://keepachangelog.com/en/1.1.0/
+https://github.com/olivierlacan/keep-a-changelog

knowledge base/file permissions.placeholder

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+https://www.cyberciti.biz/faq/howto-set-readonly-file-permission-in-linux-unix/
+
+
+Change file attributes on a Linux file system to read-only using the `chattr` command:
+
+```sh
+chattr +i /path/to/file.php
+chattr +i /var/www/html/
+
+# find everything in /var/www/html and set to read-only #
+find /var/www/html -iname "*" -print0 | xargs -I {} -0 chattr +i {}
+```
+
+```sh
+To remove read-only attribute pass the -i option:
+# chattr -i /path/to/file.php
+```
+
+FreeBSD, Mac OS X and other BSD unix user need to use the `chflags` command:
+
+```sh
+# set read-only
+chflags schg /path/to/file.php
+
+# remove read-only
+chflags noschg /path/to/file.php
+```

knowledge base/whalebrew.placeholder

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+https://github.com/whalebrew/whalebrew

knowledge base/zed.placeholder

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+// For a full list of overridable settings, and general information on folder-specific settings,
+// see the documentation: https://docs.zed.dev/configuration/configuring-zed#folder-specific-settings
+https://zed.dev/