Use SVG LaMa icon instead of PNG

Because PNG is not scalable and looks ugly.
The actual SVG was generated using https://viereck.ch/latex-to-svg/ from
the following LaTeX code:

\lambda\kern -.1667em\lower -.5ex\hbox{$a$}\kern -.1000em\lower .2ex\hbox{$\mathcal M$}\kern -.1000em\lower -.5ex\hbox{$a$}

Signed-off-by: Kakadu <Kakadu@pm.me>

README.md

@@ -7,11 +7,9 @@
 [3]:  https://github.com/JetBrains-Research/Lama-devel/workflows/Build/badge.svg?branch=1.10
 [4]:  https://github.com/JetBrains-Research/Lama-devel/actions
 
-
-
 # Lama
 
-![lama](lama.png) is a programming language developed by JetBrains Research for educational purposes as an exemplary language to introduce
+![lama](lama.svg) is a programming language developed by JetBrains Research for educational purposes as an exemplary language to introduce
 the domain of programming languages, compilers and tools. Its general characteristics are:
 
 * procedural with first-class functions - functions can be passed as arguments, placed in data structures,
@@ -24,11 +22,11 @@ the domain of programming languages, compilers and tools. Its general characteri
 * with user-defined infix operators, including those defined in local scopes;
 * with automatic memory management (garbage collection).
 
-The name ![lama](lama.png) is an acronym for *Lambda-Algol* since the language has borrowed the syntactic shape of
+The name ![lama](lama.svg) is an acronym for *Lambda-Algol* since the language has borrowed the syntactic shape of
 operators from **Algol-68**; [**Haskell**](http://www.haskell.org) and [**OCaml**](http://ocaml.org) can be
 mentioned as other languages of inspiration.
 
-The main purpose of ![lama](lama.png) is to present a repertoire of constructs with certain runtime behavior and
+The main purpose of ![lama](lama.svg) is to present a repertoire of constructs with certain runtime behavior and
 relevant implementation techniques. The lack of a type system (a vital feature for a real-word language
 for software engineering) is an intensional decision which allows to show the unchained diversity
 of runtime behaviors, including those which a typical type system is called to prevent. On the other hand
@@ -37,7 +35,7 @@ type systems) on.
 
 The current implementation contains a native code compiler for **x86-32**, written
 in **OCaml**, a runtime library with garbage-collection support, written in **C**, and a small
-standard library, written in ![lama](lama.png) itself. The native code compiler uses **gcc** as a toolchain.
+standard library, written in ![lama](lama.svg) itself. The native code compiler uses **gcc** as a toolchain.
 
 In addition, a source-level reference interpreter is implemented as well as a compiler to a small
 stack machine. The stack machine code can in turn be either interpreted on a stack machine interpreter, or

lama.svg

@@ -0,0 +1,2 @@
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