[YDBDoc#279] Fix Rust Version in Debian Image (& misc changes)

Rust v1.48 (installed from apt in Debian 11) fails as follows when running say_hello_rust:

```
error[E0658]: use of unstable library feature 'renamed_spin_loop'
  --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.17.0/src/loom/std/mod.rs:29:20
   |
29 |     pub(crate) use std::hint::spin_loop;
   |                    ^^^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #55002 <rust-lang/rust#55002> for more information

error[E0658]: use of unstable library feature 'renamed_spin_loop'
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.17.0/src/loom/std/mod.rs:100:9
    |
100 |         std::hint::spin_loop();
    |         ^^^^^^^^^^^^^^^^^^^^
    |
    = note: see issue #55002 <rust-lang/rust#55002> for more information

error[E0658]: use of unstable library feature 'renamed_spin_loop'
   --> /root/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-1.17.0/src/sync/task/atomic_waker.rs:285:17
    |
285 |                 hint::spin_loop();
    |                 ^^^^^^^^^^^^^^^
    |
    = note: see issue #55002 <rust-lang/rust#55002> for more information

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0658`.
error: could not compile `tokio`.

To learn more, run the command again with --verbose.
error: build failed
```

Checking our YDBRust pipeline, our pipeline uses the stable version of
Rust (currently v1.59) to run its code.

Therefore, I changed this Debian image to install the stable version of
Rust.

Misc changes:
- Remove locales package, and remove US locale. We already use the
C.UTF-8 locale, which is fine for YottaDB. Remove LANG and LANGUAGE
varaibles, as these are not used by YottaDB.
- Remove clang, add gcc, as it's required by go for the tests. gcc must
have been implicitly added by other packages removed in the commit.
clang isn't needed.
- Remove vim, add nano instead.

Dockerfile-debian

@@ -93,23 +93,28 @@ RUN apt-get update && \
                     ca-certificates \
                     libelf-dev \
                     libicu-dev \
-                    locales \
                     wget \
-                    vim \
+                    gcc \
+                    nano \
                     procps \
                     make \
                     golang \
                     git \
                     pkg-config \
-                    clang \
-                    cargo \
                     python3-dev \
                     python3-setuptools \
                     libffi-dev \
                     python3-pip \
                     && \
     apt-get clean
-RUN locale-gen en_US.UTF-8
+
+# For our Rust Plugin, it doesn't work with Rust 1.48 installed by default on Debian
+# Install the latest stable version, per our pipeline in https://gitlab.com/YottaDB/Lang/YDBRust
+RUN wget -O rustup-init.sh https://sh.rustup.rs && \
+    chmod +x rustup-init.sh && \
+    ./rustup-init.sh -y --default-toolchain stable && \
+    rm ./rustup-init.sh
+
 WORKDIR /data
 COPY --from=ydb-release-builder /tmp/yottadb-release /tmp/yottadb-release
 RUN cd /tmp/yottadb-release  \
@@ -120,11 +125,10 @@ RUN cd /tmp/yottadb-release  \
       --installdir /opt/yottadb/current \
  && rm -rf /tmp/yottadb-release
 ENV ydb_dir=/data \
-    LANG=en_US.UTF-8 \
-    LANGUAGE=en_US:en \
     LC_ALL=C.UTF-8 \
     ydb_chset=UTF-8 \
-    GOPATH=$HOME/go
+    GOPATH=$HOME/go \
+    EDITOR=/bin/nano
 # MUPIP RUNDOWN need in the following chain because otherwise ENTRYPOINT complains
 # about inability to run %XCMD and rundown needed. Cause not known, but this workaround works
 # and is otherwise benign.