RFR: Replace affects_versions.png with SVG [v3]

[Alexey Ivanov]

> Replace `affects_versions.png` with Scalable Vector Graphics (SVG) image.
> 
> <details>
> <summary>PNG vs SVG</summary>
> 
> **PNG:**\
> ![affects_versions.png](https://github.com/openjdk/guide/blob/be88a6debcb0dfb7f8fb0e8f3e95ff35950ca9c4/src/images/affects_versions.png?raw=true)
> 
> **SVG:**\
> ![affects_versions.svg](https://raw.githubusercontent.com/aivanov-jdk/dev-guide/bc65ea67251cc68360fc746a77200d8c93fd78b5/src/images/affects_versions.svg)
> </details>
> 
> SVG is crisper, especially on High DPI monitors, its size is much smaller (1.04 KB vs 26.24 KB), it's easier to edit and the edit history is preserved.

Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:

  End 12-na with circle

-------------

Changes:
  - all: https://git.openjdk.org/guide/pull/147/files
  - new: https://git.openjdk.org/guide/pull/147/files/3a13348b..c48bff06

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=guide&pr=147&range=02
 - incr: https://webrevs.openjdk.org/?repo=guide&pr=147&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/guide/pull/147.diff
  Fetch: git fetch https://git.openjdk.org/guide.git pull/147/head:pull/147

PR: https://git.openjdk.org/guide/pull/147