README: pip is the install command (pipx dropped)

The release notes and the README's local-wheel examples still led with
`pipx install`; only the direct-URL form had been switched to pip earlier.
Both READMEs now show a plain `pip install <wheel>` (with the PEP 668 note to
use a virtual environment when the system Python is externally managed), and
the `gh release download` example installs with pip too.  The v2.7.10 and
v2.7.11 release bodies are edited to match.

README.md

@@ -102,16 +102,19 @@ history), or clone the repository for development.  Both bundle the same PWA.
 Everything is on the
 [latest release](https://github.com/anttro/simtrace-analyser/releases/latest).
 
-**Wheel** (recommended — an isolated install, the PWA is inside the package):
+**Wheel** (the PWA is inside the package):
 
 ```sh
-pipx install ./simtrace_analyser-2.7.11-py3-none-any.whl
-# or: pip install ./simtrace_analyser-2.7.11-py3-none-any.whl
+pip install ./simtrace_analyser-2.7.11-py3-none-any.whl
 
 # then run (the UI is served at http://127.0.0.1:8081/):
 simtrace-analyser-server --capture gsmtap
 ```
 
+If your system Python is externally managed (PEP 668 — common on Arch and
+Fedora), install into a virtual environment first:
+`python3 -m venv .venv && . .venv/bin/activate`.
+
 `pip` can also fetch the wheel straight from the release page (use the version
 shown there):
 
@@ -123,7 +126,7 @@ With the GitHub CLI, download the latest wheel without knowing the version:
 
 ```sh
 gh release download --pattern '*.whl'
-pipx install ./simtrace_analyser-*.whl
+pip install ./simtrace_analyser-*.whl
 ```
 
 **Source archive** — the *Source code (zip / tar.gz)* assets are the full tree

README_RUS.md

@@ -108,16 +108,19 @@ git) или склонировать репозиторий для разраб
 Всё находится на странице
 [последнего релиза](https://github.com/anttro/simtrace-analyser/releases/latest).
 
-**Wheel** (рекомендуется — изолированная установка, PWA внутри пакета):
+**Wheel** (PWA внутри пакета):
 
 ```sh
-pipx install ./simtrace_analyser-2.7.11-py3-none-any.whl
-# или: pip install ./simtrace_analyser-2.7.11-py3-none-any.whl
+pip install ./simtrace_analyser-2.7.11-py3-none-any.whl
 
 # затем запуск (интерфейс отдаётся на http://127.0.0.1:8081/):
 simtrace-analyser-server --capture gsmtap
 ```
 
+Если системный Python управляется извне (PEP 668 — обычное дело в Arch и
+Fedora), сначала создайте виртуальное окружение:
+`python3 -m venv .venv && . .venv/bin/activate`.
+
 `pip` также может скачать wheel прямо со страницы релиза (подставьте версию,
 указанную там):
 
@@ -129,7 +132,7 @@ pip install https://github.com/anttro/simtrace-analyser/releases/download/v2.7.1
 
 ```sh
 gh release download --pattern '*.whl'
-pipx install ./simtrace_analyser-*.whl
+pip install ./simtrace_analyser-*.whl
 ```
 
 **Архив исходников** — ассеты *Source code (zip / tar.gz)* содержат полное