chore: simplify plugin readmes, changelogs and manifest descriptions

plugins/ldap/CHANGELOG.md

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+# Changelog
+
+## 1.0.0
+
+First release, bundled with Termix 2.9.0.
+
+Lets users sign in with a username and password checked against an LDAP or Active Directory server. Members of an admin group can be made admins.

plugins/ldap/README.md

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+# LDAP
+
+Sign in with a username and password checked against an LDAP or Active Directory server.
+
+## Features
+
+- Sign in with a username and password checked against an LDAP or Active Directory server.
+- Add more than one directory. Each gets its own option on the login screen.
+- Make members of an admin group Termix admins.
+
+## Settings
+
+### Admin
+
+- Directories: the LDAP servers, search bases and admin group for each directory.
+
+## Permissions
+
+- `ldap.manage`: Add, edit and remove LDAP directories. Only admins have it by default.
+
+## Development
+
+```bash
+npm run build      # build into dist/
+npm run test       # run this plugin's tests
+npm run typecheck  # type-check this plugin
+```
+
+See `packages/plugin-sdk/ARCHITECTURE.md` for the plugin contract.