Use of system dependent path in install description results incorrect path in README

[zmully]

Describe the bug

The description for the install command uses the path variable config.dataDir which is system dependent:

plugin-plugins/src/commands/plugins/install.ts

Line 16 in 66d04c4

static description = `Uses bundled npm executable to install plugins into <%= config.dataDir %>

This results in the (usually) incorrect path in the generated README.md file as the users path is different from the path in CI, is different than the path on macOS, etc.

This also causes our precommit checks to fail since the README.md file is updated with the local path, which won't match what was checked in, as the path contains the username of the last committer.

Ideally, this would be removed from the description, or excepted from the README generation, so that different systems don't result in changesets when the README.md is generated.

To Reproduce
Steps to reproduce the behavior:

1. Generate readme on a linux system
2. Generate readme on a macos system
3. Compare the readmes, the diff will look like this:

-  Uses bundled npm executable to install plugins into /home/zmully/.local/share/px
+  Uses bundled npm executable to install plugins into /Users/zmully/.local/share/px

Expected behavior

README generation should not be system dependent.