docs: fix typos (#1705)

## Summary

Fix typos found via `codespell -S
*.txt,*.yaml,generate_kerning_ligature_epub.py -L
currenty,flate,ser,localy,logicaly,ans,clen,portugues,notin,curren`

## Additional Context

* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it helps set the right
context for reviewers.

Did you use AI tools to help write this code? _**NO**_

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

README.md

@@ -12,7 +12,7 @@ Xteink firmware. It aims to match or improve upon the standard EPUB reading expe
 
 E-paper devices are fantastic for reading, but most commercially available readers are closed systems with limited 
 customisation. The **Xteink X4** is an affordable, e-paper device, however the official firmware remains closed.
-CrossPoint exists partly as a fun side-project and partly to open up the ecosystem and truely unlock the device's
+CrossPoint exists partly as a fun side-project and partly to open up the ecosystem and truly unlock the device's
 potential.
 
 CrossPoint Reader aims to:
@@ -179,7 +179,7 @@ If you are new to the codebase, start with the [contributing docs](./docs/contri
 If you're looking for a way to help out, take a look at the [ideas discussion board](https://github.com/crosspoint-reader/crosspoint-reader/discussions/categories/ideas).
 If there's something there you'd like to work on, leave a comment so that we can avoid duplicated effort.
 
-Everyone here is a volunteer, so please be respectful and patient. For more details on our goverance and community 
+Everyone here is a volunteer, so please be respectful and patient. For more details on our governance and community 
 principles, please see [GOVERNANCE.md](GOVERNANCE.md).
 
 ### To submit a contribution: