Update readme

[purva-thakre]

Description

Fixes #2417 Fixes #2388

• Adds missing techniques to the readme: QSE, PT, RSE and LRE
• Adds an Under Construction emoji for PT, RSE and LRE
• Updates the relative path for broken Qiskit logo

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License

• [x] I license this contribution under the terms of the GNU GPL, version 3 and grant Unitary Fund the right to provide additional permissions as described in section 7 of the GNU GPL, version 3.

Before opening the PR, please ensure you have completed the following where appropriate.

• [x] I added unit tests for new code.
• [x] I used type hints in function signatures.
• [x] I used Google-style docstrings for functions.
• [x] I updated the documentation where relevant.
• [x] Added myself / the copyright holder to the AUTHORS file

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.32%. Comparing base (20732a0) to head (2fe9b34). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2421 +/- ## ======================================= Coverage 98.32% 98.32% ======================================= Files 87 87 Lines 4048 4048 ======================================= Hits 3980 3980 Misses 68 68 ```

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[purva-thakre]

IDK how to fix the broken logo in both the md and the sphinx files at the same time. I had to add ../../ to the relative path to verify the output of make docs locally.

Sphinx requires a relative path to where the logo is (screenshot from RTD).

But the .md file has the broken logo.

https://github.com/unitaryfund/mitiq/blob/9f84e0bb7c9f2b0077da186a305f6bb958bae774/README.md#supported-frontends

[purva-thakre]

Disregard my previous comment. I linked the png image directly without having to worry about the relative path.